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Confidence is a wonderful trait to have. However, too much of it can make one’s head swell. While this might sound similar to a verse from a didactic children’s book, it’s true. Overconfidence causes people to overestimate their abilities and knowledge, which are often far from reality. And we know there are few things that netizens like to do more than ridicule these instances online.

So we gathered a whole list of them, courtesy of Confidently Incorrect subreddit. Scroll down to find the most hilarious times cocky people got things totally wrong, and be sure to upvote the ones that deservingly got torn apart by the overconfidence police.

While you're at it, don't forget to check out a conversation with visibility and confidence coach and founder of ubu skills, Megan Hamilton, who kindly agreed to tell us all about confidence and its excess.

#1

So… I Guess There Are No Real Tests For Any Illnesses At All?

Text questioning vaccine safety with a sarcastic reply about cancer screenings, illustrating overly-confident incorrect people.

professorearl Report

When talking about overconfidence, we should probably first define its predecessor, confidence.

"Confidence is a byproduct of a combination of knowing who you are, self-efficacy, courage, and effort. It's the understanding that you are in fact good at what you're attempting to do," explains visibility and confidence coach and founder of ubu skills, Megan Hamilton.

"So, can somebody become too confident? I'd say no—it can't be qualified that way. However, can somebody be exuding confidence when it hasn't been earned? Absolutely. This shows up a lot in politics, for example. But I'd call that bravado, which means it's a performance, instead of exuding an earned state of being."

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    #2

    Betty Has No Mrna

    Tweet exchange displaying overly confident, incorrect claims about being mRNA-free.

    shixiaohu172 Report

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    #3

    Oh My Sweet Summer Child

    Tweet exchange about ancient Greece's history, highlighting overly confident incorrect people discussing religion inaccurately.

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    Many behaviors of humans have been observed, investigated and named, and overconfidence is no exception. People who think a little too highly of themselves are known to experience overconfidence bias. 

    "Overconfidence bias occurs when individuals overestimate their abilities, knowledge, or control over situations," explains Dr. Ozan Toy, MD, MPH. 

    #4

    Apparently Dough Doesn't Rise

    Comments showing overly confident incorrect statement about pizza size when cooked.

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    #5

    He's One-Sixteenth Irish

    Social media exchange highlighting overly confident incorrect people debating Irish geography.

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    #6

    The Holy Trinity Of Trying To Teach Someone What Prefixes Are

    Social media conversation showcasing overly confident incorrect people misunderstanding "trinity."

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    A great example of this most of us can relate to is students overestimating how quickly they can finish an assignment. After realizing the task takes longer than expected, they are, unfortunately, forced to pull an all-nighter. 

    Or when we set other overly ambitious goals, like promising to work out and eat healthy every day without excuses. The motivation instantly plummets to zero after it becomes clear that such perfection may be impossible to achieve. This is overconfidence bias in action for you.

    #7

    He Really Said That With His Whole Chest

    Social media exchange showcasing overly confident, incorrect people discussing African countries.

    1Hate17Here , x.com Report

    #8

    You Are Parents Failed You?

    Screenshot of social media comments showcasing overly confident incorrect people in a grammar discussion.

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    #9

    Someone Skipped Biology

    Comments showing overly confident incorrect people discussing human meat-eating habits.

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    Such beliefs occur due to cognitive biases, which are patterns of thinking that interpret reality subjectively rather than relying on facts and rational judgment. It affects how we process information and make decisions, resulting in flawed reasoning, like overestimating knowledge and abilities.

    Psychologist Dillon Harper, PhD, also suggests that overconfidence is our brain’s attempt at boosting our self-esteem and reducing anxiety. By minimizing or ignoring our failures and focusing on past successes, it makes us more relaxed and sure of ourselves.

    #10

    On A Flat-Earth Post

    Two comments in a heated debate, showcasing overly confident incorrect people discussing sunlight and color.

    Wizard_john10 Report

    #11

    Georgia

    A text exchange illustrates overly confident incorrect people discussing Georgia's existence.

    rengam Report

    #12

    Tiktok Kids These Days

    Social media exchange with overly confident, incorrect statements about ADHD and autism spectrum.

    Maddi-The-Baddi Report

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    Our brain’s tendency to convince us that we are better than we actually are can be boosted by our lack of experience, as we don’t have enough knowledge to accurately evaluate our abilities. Another factor that plays a part in this is our upbringing.

    "Overconfidence bias is often the result of what we call ‘false empowerment’ in childhood," says licensed marriage and family therapist Renée Zavislak. "Parents who consistently tell their children things like, 'You're the best' and 'You are good at everything you do' rather than true, realistic compliments like, 'Yours is my favorite' and 'I am proud of you,' tend to foster the development of an overconfidence bias."

    #13

    5am Is 5am

    Social media exchange showcasing overly confident incorrect people in a humorous debate.

    AdSpecial9305 Report

    Hamilton agrees that overconfidence can be learned from the behaviors of others and even obtained by privilege.

    "An example of this might be somebody who is not a medical doctor diagnosing somebody else with a medical condition because they feel that they are knowledgeable on the topic—possibly because they have the same condition or because they're somewhat familiar with it. But if "they don't know what they don't know," there could be myriad other symptoms or outcomes they aren't aware of, leading to a misdiagnosis. The impact can be disastrous," she warns.

    #14

    Is This Really What Americans Are Like?

    Text exchange highlighting overly confident incorrect people discussing the usage of the dollar symbol.

    KittyboiYT2 Report

    #15

    Stay In School, Kids

    Screenshot of a discussion featuring overly-confident incorrect people confused about English identity.

    TheBatmam Report

    Due to these factors, many people have excessive faith in themselves. Research shows that 73% of U.S. drivers believe to be better than average, which is statistically impossible. A study with spelling tasks found participants to be 100% sure of their answers but 80% of them were actually right.

    Additionally, a whopping 65% of Americans think they’re smarter than average, with the figure being even higher when it comes to men. These are just a few examples proving that no one is safe from experiencing overconfidence bias, just like these people on this list.

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    #16

    Physical Isn’t Actually Assault

    Overly confident incorrect people arguing about physical altercation online.

    PerhapsNotMaybeSo Report

    #17

    I Don’t Think That’s How It Works

    Social media post with user incorrectly claiming C-section isn't birth, showcasing overly confident incorrect people.

    Last-Quarter-432 Report

    #18

    Paycheck/Paycheque

    Social media exchange highlighting overly confident incorrect spelling of "paycheck."

    Soytheist Report

    Thinking highly of ourselves can affect our daily behaviors and decisions. "When we overestimate our abilities, it's like walking a tightrope with a blindfold. We’re more likely to take unnecessary risks, ignore important feedback, or skip preparation because we think we’ve got it all under control," Dr. Harper says.

    "When things don't go as planned, the fall from that high can be harsh, leading to disappointment and a hit to our self-esteem."

    It can also negatively impact relationships, as few people like overconfidence that leans towards arrogance.

    #19

    Just… No

    Social media exchange illustrating overly confident incorrect people discussing tetanus prevention.

    ExpertAccident Report

    #20

    Chihuahua's Kill More Infants Than Pitbulls

    Comment highlights overly-confident incorrect claims about dog attack statistics in Chihuahua, Mexico.

    increment1 Report

    #21

    Fool Still Stubbornly Believes That Vaccines Cause Autism

    Tweet claiming vaccines cause autism with added reader context debunking the claim.

    ZhangtheGreat Report

    Knowing when you’re overpushing your faith in yourself can be difficult. Therefore, we all should aim to be realistic. “It's important to acknowledge that no one is perfect. We've all experienced failure at some point, and often, these failures are crucial to our growth and evolution," says therapist Racheal Turner, LPC. "When we overestimate our abilities and leave no room for improvement, we do ourselves a disservice by assuming we're the best at everything."

    #22

    Everybody Can Run 7 Minute Miles

    Text exchange showing overly confident incorrect statement about running, with a rebuttal pointing out physical limitations.

    r_special_ Report

    #23

    Apparently We Are Not Animals

    Social media comment showcasing overly confident incorrect people, with reply interaction visible.

    CarpenterWeary2724 Report

    #24

    That’s One Way To Approach The Topic I Guess…

    Social media post displaying overly confident incorrect person claiming to solve Earth origin query with Bible reference.

    evanctaylor Report

    "What you might do is ensure that experts weigh in on your choices, that you work with mentors that you trust, and that you seek the opinions of others and work in teams and communities to keep yourself in check and are appropriately proud of yourself for your achievements," adds Hamilton. "Try to avoid echo chambers where you'll only receive positive feedback. Don't speak on topics where you're not adequately experienced."

    #25

    Comments In Response To Someone Saying That 10 Years Is 15% Of Your Life

    Incorrect calculation in a social media comment highlights overly confident errors with a humorous response.

    Nucleuh_Powuh Report

    #26

    I Emailed Hr After Noticing A Pay Error. This Was Their Response

    Email showing a math error in pay raise calculation; overly confident incorrect people.

    Zeptic Report

    #27

    *you're

    Reddit comment exchange highlighting overly confident incorrect grammar use.

    FightingTable Report

    Even if we have skills and possess talent, we should never stop learning and do better. Some additional tips that help to avoid becoming the victim of overconfidence are to question our choices and seek out other points of view by diversifying our information sources. 

    #28

    Facebook Always Provides

    Streamer smiling during a live session, wearing headphones and a durag, with comments highlighting overly confident incorrect statements.

    epsilon14254 Report

    #29

    You’d Have To Be Drunk To Be That Wrong. We Literally Evolved Into Tolerating Naturally Fermented Fruits, Then Learned To Make Our Own From Grains

    Overly confident person sharing an incorrect fact about alcohol and social drinking on social media.

    Neolithique Report

    #30

    “You’ve Gotten Off Lucky”. The Smugness Is Killing Me

    Comments showcasing overly confident incorrect people discussing asexuality in a YouTube thread.

    Kira_Bad_Artist Report

    #31

    I Actually Had To Leave Out Even More Military Holidays For The Sake Of Space!

    Person holding sign on sidewalk displaying overly confident incorrect statement about veterans' recognition.

    professorearl Report

    #32

    Big Brain

    Van with "Ambulance" written backward, illustrating overly confident incorrect application.

    heyzooschristos Report

    #33

    The Amount Of Likes Is Scary

    Social media debate on whether Wales is a country, showcasing overly confident incorrect people.

    EvelKros Report

    #34

    A True Expert In Womens Anatomy

    Social media comments showcasing overly confident incorrect people discussing anatomy.

    PumpkinkPatch Report

    #35

    For All Intents And Purposes, Etc…

    Screenshot of Reddit comments showcasing overly confident incorrect people discussing anatomy.

    Olyve_Oil Report

    #36

    American Architecture > European Architecture

    Overly confident statement about European and American architecture with the Statue of Liberty pictured.

    HeiligerJacobus Report

    #37

    No, Thats Wrong Dumb Dumb

    Social media exchange highlighting overly confident incorrect people in a grammar debate about "too" vs "to."

    biscoita Report

    #38

    Red Blood Cells Are Not Real Cells

    Online debate highlighting overly-confident-incorrect-people discussing red blood cells.

    bumblebleebug Report

    #39

    When A Bot Corrects You But You Double Down On The Mistake

    A confident person incorrectly insists "could of" is a formal phrase in an online comment.

    Optimal_Cynicism Report

    #40

    Somebody Refuses To Learn Junior High School Astronomy

    Overly confident incorrect people debating the Earth's distance from the sun on social media.

    PirateJohn75 Report

    #41

    I Think This Belongs Here... 💀

    Twitter exchange highlighting overly confident and incorrect statements about archaeology.

    pizz_amozzarella Report

    #42

    Poor Sod Doesn’t Know What An Idiom Is

    Screenshot of a conversation showcasing overly confident, incorrect people debating idioms and language usage.

    KitonePeach Report

    #43

    Hmm

    Meme of overly confident incorrect people discussing months with 31 days.

    Knee_Strong Report

    #44

    Not How Percentages Or Averages Work

    Screenshot of a discussion showing an erroneous math claim about topless beach survey results.

    sudosciguy Report

    #45

    Some People Are Just Allergic To Telling The Truth

    Social media exchange highlighting overly confident incorrect people discussing crime statistics.

    MelanieWalmartinez Report

    #46

    This One Hurt My Brain

    Reddit post showing discussions and corrections on LGBTQ identities, highlighting overly confident incorrect statements.

    LyttleMysseWolfe Report

    #47

    It's Spelled Frunk

    Tesla Cybertruck with open frunk, humorous correction highlights overly confident incorrect people.

    Indigo-au-naturale Report

    #48

    Most Peaceful Man

    A person's comment expressing overly confident but incorrect historical claims.

    GeorgRaev22 Report

    #49

    Snakes Are Not Reptiles And Dinosaurs Didn’t Exist

    Exhibit of Titanoboa with comments showcasing overly confident, incorrect people about reptiles and dinosaurs.

    ZhangtheGreat Report

    #50

    How Dare They Use French In France…

    Text conversation about the term "femmes" at the Olympics, highlighting overly confident incorrect people.

    ExtremeOccident Report

    #51

    I Can Prove 0.999... Doesn't Exist! Step 1: .999... = 1-1-0

    Reddit post of an overly confident person incorrectly proving 0.999... does not equal 1, leading to humor and confusion.

    [deleted] Report

    #52

    I'm Embarrassed Grown Adults Can Be Brainwashed

    Text conversation illustrating overly confident incorrect people discussing conspiracy theories.

    im2short4this Report

    #53

    On A Post About Schools Bringing Back Their Old Names For Confederate Leaders

    Screenshot of a social media post with overly confident incorrect people discussing the Civil War.

    Mr_Jackcity Report

    #54

    Men Are Missing A Rib, Just Google It

    Screenshot of a text conversation where people confidently discuss incorrect rib facts.

    jrDoozy10 Report

    #55

    2% Does Not Equal 1 In 50

    Incorrect math claim on social media post highlighting overly confident people with wrong information.

    Subject-Dot-8883 Report

    #56

    “Barista” Confidently Incorrectly Thinks There’s No Difference Between A Latte And A Cappuccino

    Text post about overly confident incorrect people, discussing a drive-thru coffee experience.

    lightly-sparkling Report

    #57

    There Is No Such Thing As “444 Million Years Ago”

    Twitter thread showcasing overly confident incorrect people discussing planetary rings and historical records.

    Character-Year-5916 Report

    #58

    Yikes

    Overly confident incorrect math equation with comments correcting the mistake.

    Temporary-Wrap-6094 Report

    #59

    Repost, Just With The Names Removed

    Math puzzle image with overly confident incorrect answer to the equation "2+2+2+2+2+2+2+2x0+2=?"

    serouj2000 Report

    #60

    Transphobes Don’t Even Know How Chromosomes Work

    Social media comment exemplifying overly confident incorrect people, discussing gender identity with misunderstandings.

    jumbled_beans Report

    #61

    What Modern Human Doesn’t Know This? Uh…you, Friend

    Airport scene with missed flight details; overly confident passenger seeks manager, confused about departure time.

    Tony_Three_Pies Report

    #62

    Woke Up To This Conversation Between My Co-Owner And A New Member 😭

    Text exchange showing overly confident incorrect people discussing South America's location.

    xhyenabite Report

    #63

    You Don't Understand

    A social media exchange showcasing overly-confident incorrect people discussing evolution theory.

    G3rmTheory Report

    #64

    Vienna, Australia

    Social media post showing overly confident incorrect people discussing Vienna's location with a map of Austria.

    onablanketwithmybaby Report

    #65

    "Spain Didn't Have Colonies, Cope."

    Two social media comments showing overly confident incorrect people discussing colonial history.

    Redditvagabond0127 Report

    #66

    "My Source? Righteous Indignation."

    Stack of books versus eyes meme illustrating overly confident incorrect people.

    SoundDave4 Report

    #67

    An Argument Over What’s Part Of Africa And What’s Not

    Map discussion showing overly confident incorrect people debating Africa's location relative to Syria and Lebanon.

    7LeagueBoots Report

    #68

    “Y’all” Isn’t A Plural “You”

    Reddit discussion highlighting overly confident incorrect people debating Spanish language usage.

    daboys9252 Report

    #69

    50 Years Is A Long Time To Be So Wrong

    A social media post by an overly confident individual incorrectly explaining selective breeding.

    harry_fifteen_ones Report

    #70

    If You're Gonna Be A Grammar Nazi, Make Sure You're At Least Correct

    Online comment with grammar error corrected, showcasing overly-confident-incorrect-people.

    EscapedSmoggy Report

    #71

    Asexual

    Screenshot of a Reddit conversation featuring overly confident yet incorrect comments about the definition of asexual.

    Z2_U5 Report

    #72

    Guy Thinks That The Democratic And Republic Parties Haven’t Had Political Shifts In Over 150 Years

    Reddit thread showing overly confident incorrect people discussing political parties and historical events.

    YEETAWAYLOL Report

    #73

    Wh1tes Can't B3 4frican! 🤡

    Social media exchange showing overly confident incorrect people discussing African identity.

    conejita_chiquita Report

    #74

    Literally Could Of Killed That Grammar-Bot

    Online comment thread showing overly confident incorrect people arguing about grammar usage.

    namebrandcloth Report

    #75

    Basic Physics

    Comments showcasing overly confident incorrect people discussing a Sherlock scene.

    TheWouldBeMerchant Report

    #76

    Each Country Has Its Own Sun

    Text post about the Sun changing color, exemplifying overly confident incorrect people.

    SuitableJelly5149 Report

    #77

    Neither Films Nor Geography Are This Guy’s Specialist Subject…

    Social media thread showcasing an overly confident person incorrectly mixing up Ireland and Scotland.

    apex204 Report

    #78

    Are Posts From This Sub Allowed Too?

    Reddit thread showcasing overly confident incorrect opinions about the status of countries in the UK.

    RD____ Report

    #79

    Kids Are Dumb 💀😭

    Comments depicting overly confident incorrect people discussing game prequels.

    TheLightners Report

    #80

    Transphobe Embarrasses Themselves

    Screenshot of tweets showcasing overly confident incorrect people discussing anatomy misconceptions.

    TheChaosIndex Report

    #81

    Mathematician Proves The Earth Is 8,000 Years Old

    Comment with incorrect math about Earth's age from overly-confident person.

    Kabuut Report

    #82

    I'm No Thermodynamics Expert But This Misguided One Is Wild

    Text exchange showing overly confident incorrect people discussing microwave use.

    SomeDoOthersDoNot Report

    #83

    Another Day Of Texans Overestimating How Big Texas Is

    Screenshot of a comment showing an overly confident incorrect person discussing U.S. and Europe road mileage.

    TheMercyOfOlympus Report

    #84

    Your An Idiot

    People correcting grammar online, showcasing overly-confident incorrect people.

    OkuroIshimoto Report

    #85

    A Tablespoon Always Weighs The Same

    Crushed croutons in a tablespoon with a cheese & garlic flavored bag and salad, showcasing overly confident incorrect advice.

    yeliabish Report

    #86

    Sex Education Is Important Kids

    Comments from overly confident incorrect people about pregnancy myths.

    FinlandIsForever Report

    #87

    Apparently Ocean Travel Is Impossible… Because Of “Gyers”

    Overly confident person claims ocean crossings are impossible due to gyres, showing a historical map of Atlantic s***e trade routes.

    NiijiK Report

    #88

    When You're From The UK And Don't Even Know The Geographic Boundaries Of Your Own Country

    Jonathan Ross criticized for claiming Cillian Murphy is British; Facebook comments reveal overly confident incorrect people.

    scubasteve254 Report

    #89

    I’m Squeezing These Seeds And Nothing Is Happening :(

    Text conversation showing a confident but incorrect statement about flax seed oil extraction.

    Chewbaccabb Report

    #90

    A Silly Person Not Understanding Physics

    Two images showing a measuring cup with water and ice, labeled to suggest incorrect environmental insights.

    samprich Report

    #91

    Finally Found One

    A screenshot of an overly confident comment claiming the sun's explosion would be detected 11 years later.

    hetty147 Report

    #92

    "6th Grade Problem In Europe"

    Math problem error discussed by overly confident incorrect people.

    Don__Geilo Report

    #93

    It's Just A Theory/S

    Screenshot of a comment showcasing an overly confident yet incorrect statement about scientific theories.

    G3rmTheory Report

    #94

    Good At English

    Social media post featuring overly confident people debating grammatical correctness.

    lobotech99 Report

    #95

    Bro Really Thinks Sophie Charlotte Isn't White

    Overly confident incorrect comment about ethnicity with a photo of a smiling woman at Rio Carnival.

    pka_Boaz Report

    #96

    Approximately 47 Mm Lol

    Image of a caliper measuring a u-bolt, highlighting incorrect dimensions by overly confident reviewers.

    Onefish257 Report

    #97

    Simple Math Oh God

    Text-based meme with a math puzzle highlighting overly confident incorrect people.

    dengoy-px Report

    #98

    I (Blue) Just Got Fb Jailed For The Funniest Reason Ever After Fight W/ Transphobes In Comments

    Social media comments exemplifying overly-confident-incorrect-people discussing trans identities.

    professorearl Report

    #99

    🤦‍♀️ Dude Is Exhausting

    Meme about overly confident incorrect people misunderstanding satire, featuring James Bond.

    Inevitable-Cellist23 Report

    #100

    F In Math

    Comments on a meme showcasing overly confident incorrect people reacting to game statistics.

    Sam_Tartner Report