What is this Comedy Movie?

I remember watching a film when I was a kid but I forgot almost everything about it but I really want to see it again. I remember it was a parody comedy type movie with a style similar to the Scary Movies series. I remember there was one scene where everyone started projectile vomiting on each other. Another random scene I remember made fun of Forrest Gump where the kid ran with a brace on his leg that broke, but instead of just the brace falling, it was this crazy amount of ridiculous metal pieces. That's all I remember of the entire movie. Hopefully that's enough for you to recognize it. Thanks!