Soda, soda pop, pop, coke... I hate it when people seem to get legitimately bothered by it.
"It's soda."
"Yeah, pop."
"No, I mean, it's called soda."
"Soda, soda pop, whatever."
"No, you don't understand...!"
On a hypocritical note, I despize hearing "Duck, Duck, Grey Duck" instead of "Duck, Duck, Goose". The former feels racist! :p