Just got back from the midnight showing of this, the 400 person theatre was nearly full which kind of suprised me. The movie itself was freakin hilarious, the whole crowd was laughing nearly nonstop for the entire 90+ minutes. Zach Galifianakis, Bradley Cooper, and Ed Helms were fantastic and Justin Bartha was good too though he didnt have as much screentime.
Mike Tyson also had a funny 5 minute or so part and there are a few more famous people in smaller roles like Jeffrey Tambor and Mike Epps. The movie is VERY rated R and im actually suprised it was able to get away with as much as it did. Its not the best movie you will see but it definately will make you laugh...alot, i give it 8/10 and can see why its so high on Rotten Tomatoes.