The Hangover was one of the best comedies of the last 20 years. What a shame it took people this long to catch onto how good a director Todd Philips is. I put the unrated version of Old School as one of the funniest movies ever made. OK, so Todd had a few stinkers in there as well, and many were not so crazy about The Hangover Part 2, although I enjoyed it for what it was.
The Hangover Part 3 breaks with tradition in there is no bachelor party and no wedding, but they do return to Las Vegas. From Director Todd Philips - "The Hangover Part III is Alan’s story. He’s going through a crisis after the death of his father, [and] the Wolfpack is all he has."