Ah yes, someone mentioned Kung Fu Hustle. Great movie, probably one of the funniest movies I've ever seen. It's available for free on YouTube (in parts), so you have no reason to not watch it.
Haven't seen Shaolin Soccer though.
shailin soccer is better than kung fu hustle. however, "Kung Pow: Enter The Fist" is on a completely different level. its easily one of the funniest movies i ever seen.