I KO'd a mini Luigi in All-Star Mode, very easy (I suck mind you! I'm trying to get all the all star trophies and some coins before I move onto easy). After I knocked him up and out of the stage, he sounded high off of helium and cocaine. AAAAA HAHAHAHAHAHAHAA! :P
Mario sounds the same I believe.
Hear Mini Link, Pichu, Mini Zelda/Sheik and Mewtwo voices. ;) :D