The Hangover is a comedy film directed by Todd Phillips, written by Jon Lucas and produced by Todd Phillips and Daniel Goldberg. The movie was made for Warner Bros. Productions and made by Legendary Pictures. The film stars Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, and Heather Graham.

The main plot follows four friends who travel to Las Vegas for a bachelor party, only to wake up the next morning not remembering a thing and missing the groom, whose wedding is scheduled to occur the next day. The film was released in North America on June 5, 2009, to critical praise and box office success.