When three friends finally come to after a raucous night of bachelor-party revelry, they find a baby in the closet and a tiger in the bathroom. But they can't seem to locate their best friend, Doug – who's supposed to be tying the knot. Launching a frantic search for Doug, the trio perseveres through a nasty hangover to try to make it to the church on time.
- Genre: Comedy
- Studio: Warner Bros. Pictures, Legendary Pictures, Green Hat Films
- Keyword: blackjack, stag night, hangover, lost weekend, chapel, hit with tire iron, memory loss, las vegas, drugs, duringcreditsstinger, elevator
- Cast: Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, Heather Graham, Sasha Barrese