After a promising start, this degenerates into a murky copy of the outlandishly fun original. This time out, the group heads to Thailand for Stu’s wedding. Stu (Ed Helms) wants no part of any bachelor party, but a single drink on the eve of his wedding leads to all sorts of filthy shenanigans in Bangkok. Director Todd Phillips regurgitates a lot of the same jokes—this time with a darker, more sinister twist. Zach Galifianakis, who simply ruled in the first movie, gets a bit tiresome. Only Bradley Cooper manages to be consistently funny as the jokes get sleazier and sleazier. There’s a monkey instead of a tiger, and Mike Tyson shows up singing again. This is one of the biggest disappointments of the summer, and perhaps the year.