Two days before his wedding with the wealthy Tracy Garner, Doug Billings travels to his bachelor party in Las Vegas with his best friends, the school teacher Phil Wenneck and the dentist Stu Price, and Tracy's unconventional brother Alan Garner. Tracy's father lends his convertible Mercedez Benz that is his pride and joy to Doug with many recommendations. The quartet rents the best suite in the Caesar's Palace and they go to the roof to celebrate. Alan proposes a toast to Doug and they drink his booze. On the next morning, Phil, Stu and Alan have a hangover and they do not recall what they did last night; the room is upside down; Doug is missing; there is a baby in the wardrobe; a tiger in the bedroom; a chicken in the room; Stu has a missing tooth; and Doug is missing. The trio tries to track down last night to find what happened and sooner they discover that Stu married the stripper Jade (heather Graham) and Alan has spiked their booze with "Good Morning, Cinderella" in the beginning of their crazy night.

Will be Bradley Cooper and Justin Bartha's third film together as they starred in both New York, I Love You (2009) and best friends in Failure to Launch (2006).

Phil Wenneck:
Tracy, it's Phil.


Tracy Garner:
Phil, where the hell are you guys?


Phil Wenneck:
Listen, we fucked up. We lost Doug.


Tracy Garner:
What? We're getting married in *five hours*.


Phil Wenneck:
Yeah... that's not gonna happen.

Continuity: Right after the scene where the guys let Mr. Chow out of the trunk. Alan was sitting against the front wheel of the car. As the camera angle changed he was sitting against the door. And as the camera angle changed once more, he was sitting in front of the wheel again.

Performed by Baha Men