Holy. Shit. Funniest film this year and hard to imagine something that could beat it (maybe Bruno).
The film is about four friends that get together for a bachelor party and head to Las Vegas for some alcohol fueled fun. The film fast forwards to the next morning where they wake up with very hazy memories from the night before, a tiger in the bathroom, a baby in the closet and the groom missing. The rest of the film has them piecing together the night before with clues that they start to collect when retracing their steps (one of them has a hospital admittance bracelet, when they order the valet to get their car the valet returns with a Las Vegas squad car).
It's like an old film noir, but with a really funny, really raunchy take on it (and it earns its R rating in spades - just stay for the end credits to get a taste of how far this will go).
And Tyson is freaking hilarious with his little bit in the film. Never thought I'd see him singing to Phil Collins, especially after seeing the documentary on him.