What is the name of this dark comedy?

Question

Basically, a bunch of college students get together for a party. One of them brings along a guy that gave him a lift, the guy turns out to be some sort of bigot/rapist/creep, and just as he starts to get violent they kill him.

They succeed in covering up the murder, but it leads to each of them considering to murder other people just to help out society.

Answer 1

The Last Supper.  Cameron Diaz is in it, and they get the tables turned on them by a Rush Limbaugh- type character at the end.  Good flick

Answer 2

Yeah, I liked that one as well.

It was The Last Supper

http://www.imdb.com/title/tt0113613/