You have to be kind of impressed by the ball size of "The Hangover II." It literally is like "We don't care that you think this is the same movie as the first 'Hangover' because you guys loved that film, and you will love this one just as much. And yeah we substituted a monkey for a baby, and a face tattoo instead of a missing tooth, and yeah there will be some other celebrity cameos (but not Mel Gibson) and yeah, for some implausible reason Doug will still not be with the group even though he's obviously gone to Thailand for Stu's wedding." Because you know what? This movie will be different in some very crucial ways, as evidenced by this trailer.
See? It's like one YouTube commenter said, "I love how they checked the roof first." Twists and turns, people!