Snow Cone?
That part when the Kathy Ireland character (before she looked like herself) is making an ice sculpture and asks "anybody for a snow cone?" has to be one of the funniest scenes in this movie. I'm talking about Sam Jackson's reaction to the question. He jumps up with a sort of manic glee and rushs over as fast as can be.
For me this is the funniest scene in the movie. Lots of scenes come close but I didn't laugh as hard as when that one scene played itself out. I think the reason the scene worked is because you usually don't see Sam Jackson act like that in any movie he's been in.