From smug grammar corrections to jaw-dropping misunderstandings about how women's bodies work, these are moments when people were so sure of themselves—and yet so completely off the mark—that the secondhand embarrassment is still echoing. Sit back and enjoy the cringe!
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Bull Yogurt

Photo: u/general_kael04Reddit
Their They're

Photo: u/snafe_Reddit
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All That, And For What

Photo: u/katiebludReddit
Oh Boy

Photo: u/Balloon_911Reddit
That's Not It

Photo: u/GamersAndGatherersReddit
Hmmm

Photo: u/RyanRotReddit
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HO2

Photo: u/Firewall506Reddit
Just Using Made Up Numbers Now

Photo: u/BorizwithazReddit
There's No Difference, Except These Key Differences

Photo: u/Anonymous_Browser_Reddit
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The Hashtag

Photo: u/Rati0hReddit
Nice

Photo: u/Dennis_DZReddit
True

Photo: u/Me_and_DuBoisReddit
PS

Photo: u/Thumbs0fDestinyReddit
Literally

Photo: u/Dreams-in-DataReddit
Oh No

Photo: u/JeSuis_NEXT_LadyReddit
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Put It Diagonal

Photo: u/LabelFiddlerReddit
That Might Be An Indication, Yeah

Photo: u/Cikin1Reddit
Makes Sense

Photo: u/nettiespaghettieReddit
Quick Maths

Photo: u/ed40carterReddit