The Hangover is a 2009 comedy film directed by Todd Phillips, who also directed the films Road Trip, Old School, and Starsky & Hutch. 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 stars Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, and Heather Graham. The...