What you ask to find out if someone is stupid or not.
"Whats 9+10?"
"21"
"You stupid!"
Some would say its 19 but in fact its 21
Guy 1: What's 9 + 10
Guy 2: 21
Guy 1: no its 19
Guy 3: Bruh
jack:hey
patlike:i
jack:why i?
patlike:what 9+10?
jack:21?
patlike:no dumb. its 19.
jack:oh.
unknow:s u s