Two days before his wedding, Doug (Justin Bartha) and his three friends (Bradley Cooper, Ed Helms and Zach Galifianakis) head to Las Vegas. They plan to have a night out they'll never forget. But when they wake up they can't remember a thing about the night before and Doug is missing. They try to retrace their steps from the night before so they can find Doug and get him back to LA in time for his wedding. With Heather Graham and Mike Tyson. Contains strong sexual images, sex references and strong language.Read more facts
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