I just got home from seeing "Forgetting Sarah Marshall" - OMG, it was so funny! If you liked "Superbad" then you'll definitely like this one. I drank a (free!) soda, and two bottles of water, and REFUSED to get up from my seat to, um...reverse the process, shall we say? I didn't want to miss a minute of the movie.
Go see it. Go now. Don't drink a lot.