"The Hangover" is a 2009 American comedy film directed by Todd Phillips. The film follows a group of friends who travel to Las Vegas for a bachelor party and wake up the next morning with no memory of the previous night's events and the groom missing.
The main characters are Phil Wenneck (played by Bradley Cooper), Stu Price (played by Ed Helms), and Alan Garner (played by Zach Galifianakis), who embark on a wild and chaotic adventure to retrace their steps and find their friend Doug Billings (played by Justin Bartha) before his wedding.
As they piece together clues from their night of debauchery, the trio encounters various mishaps, encounters colorful characters, and navigates Las Vegas's seedy underbelly. Along the way, they uncover shocking revelations and must race against the clock to make it back in time for the wedding.
"The Hangover" received widespread acclaim from critics and audiences alike for its hilarious and unpredictable storyline, memorable characters, and comedic performances. It became a massive box office success, grossing over $467 million worldwide and spawning two sequels, "The Hangover Part II" (2011) and "The Hangover Part III" (2013). The film's success solidified its place as one of the defining comedies of the 2000s.