SUBREDDIT: r/pettyrevenge
TITLE: I have shut up about Gangham Style!
POST: Me and my friends were talking about pokemon and someone said something about Psyduck. Then sme dude turns around and says, 
"WOULD YOU SHUT UP ABOUT GANGHAM STYLE?" and proceeds to insult our music taste and knowledge of music. The knowledge part legitimately pissed me off, so I said (thank god for Wikipedia), "We are not, in fact talking about North Korean pop star
TL;DR: 
dumbass insults my knowledge of music while I was talking about Pokemon, he gets a long list of facts about Gangham Style.