Nasty little kids

My wife is a 3rd grade teacher and yesterday she took her class on a field trip to the Colorado History Museum.  This is probably where the idea came from but who can tell where the ideas for gags or plot lines come from?  
Aren't we happy that in reality little kids do not talk like they do on the TV show South Park?
Cartman: You so much as TOUCH kitty's ass, and I'll put a firecracker in your nutsack and blow your balls all over your pants.
Stan: Jesus, Cartman.
Cartman: Well, I'm just sayn', man, seriously, don't mess with kitty, man.