The movie happened to come on the Stars network one night after a good toking session. It was called Eight Heads in a Dufflebag starring Joe Pesci. This guy is so fucking hillarious. You ought to watch My Cousin Vinny as well.
So basically this movie is about this mafia guy (Pesci) whose wacked a bunch of guys (eight to be specific) and now he is bringing there severed heads back to the boss to prove he's done the job. He puts all the heads in a dufflebag and has to check it at the airport. Somehow his bag gets mixed up with some med student who is going to meet his gf's parents for the first time. So things get really funny pretty quick while Pesci is trying to track this guy down. You won't stop laughing.
Another honerable mention, Freddy Got Fingered. I laughed so hard I got nauseous. (sp?)