I have this weird glitch with Jiggly Puff. You go to the bridge arena, then you get the smash ball, use it when the bridge breaks, then you stay big until you die or the game ends.
I assume you're talking about Super Smash Bros. right? Yeah, there are a bunch of nifty little glitches, some that help and some that just plain take away the fun. I still fool around with the black hole glitch in Melee; that one was the tricky one.