I thought for sure that the premise of all these actors "playing" themselves would get old 15 minutes into the movie. However, I was dead wrong and this is one of the funnier movies that has come out in a while. While the movie was pretty raunchy at times (whether it be the dialouge or the physical stuff shown on screen), the comedy was based in that they were all famous people reacting to the situation and just blatantly making fun of each other. What made it even funnier was the random pop ups of the celebrities NOT in the poster above. Michael Cera totally stole every scene he was in. You can completely tell that all these guys are friends and really enjoyed making this.
I would definitely recommend people checking this out if you are looking for some great laughs. It's such a simple concept but handled in the right way that delivers the laughs throughout the movie.