What movie is this?

I'm positive I saw Ethan Suplee in a movie where, in the opening 15-20 minutes he and another guy are in a car, driving to Mardi Gras from their home in Washington D.C. and they happen to hit & kill a guy in Mississippi and when the cops show up, they get busted for a joint in one of their pockets.

I was watching it at a friend's house but I had to leave, so that's the only part that I saw.

My friend said it was called "Bad Trip," but a search for that doesn't return any movies that sound like they have a similar plot...

Any ideas on what this movie could be?