Three friends – Doug Billings, Stu Price, and Phil Wenneck head to Las Vegas for a promising epic bachelor party. They take along Alan Garner, Doug’s fiancée’s unhinged brother – along for the ride. What happens in the next 24 hours they will never forget – or remember. Alan, Stu, and Phil all wake up in a luxury villa at Caesar’s Palace – to find Doug, the guest of honor – missing. They also find a chicken, a tiger, a random baby, a missing tooth, and a parking stub. As they put together the pieces of the night before they soon realize that there is more to this story than once thought. And did Stu get married to a stripper? And where is Doug?
From the movie The Hangover
Synopsis from IMDB (halo1k)