The Hangover: Part II smashed box office records in its opening weekend. The movie's spoilers indicate that the show is quite funny even though many have called it a raunchier copy of the first movie.
In The Hangover: Part II, Stu (Ed Helms) is the person getting married in Bangkok. Spoilers for the film show that despite it looking like the wedding may not happen, Stu eventually does end up getting married with a decorative tattoo on his face (which happened to cause no small trouble for the studio and actually threatened the movie's release when the tattoo artist sued).
Right before he says his "I do's," Stu gives a speech where he declares that he has "a little demon inside him." It appears as if The Hangover's good guy is going to enjoy his dark side a bit, which should come in handy for the Hangover 3, which has already been promised.
If you haven't had the chance to see this movie yet, then hopefully this The Hangover: Part II spoiler can hold you over for a bit until you can go see the hilarity for yourself.