The Hangover is a 2009 American comedy film directed by Todd Phillips, and written by Jon Lucas and Scott Moore. It is the first installment in The Hangover trilogy. The film stars Bradley Cooper, Ed Helms, Zach Galifianakis See more

Two days before his wedding, bachelor Doug Billings travels to Las Vegas with his best friends Phil Wenneck, a sarcastic secondary school teacher, Stu Price, an apprehensive … See more

Writing
The plot of The Hangover was inspired by a real event that happened to Tripp Vinson, a producer and friend of executive producer Chris … See more

Critical response
On Rotten Tomatoes, The Hangover has an approval rating of 79% based on 240 reviews with an … See more

• Bradley Cooper as Phil, a teacher and the leader of the Wolfpack
• Ed Helms as Stu, a dentist
• Zach Galifianakis as Alan, Doug's socially inept future … See more

Box office
The Hangover was a financial success. As of December 17, 2009 , it had grossed $467,416,722, of which $277,322,503 was in Canada and the … See more

By depicting and celebrating Las Vegas as the "ultimate guys' getaway", The Hangover had a major impact on Caesars Palace and Las Vegas. It was reported in 2013 that as of that year, guests were still continuing to quote to Caesars Palace staff two lines from … See more