The Hangover is a 2009 American comedy film directed by Todd Phillips. The film is written by Jon Lucas and Scott Moore, and produced by Todd Phillips and Daniel Goldberg. It stars Bradley Cooper, Ed Helms, Zach Galifianakis, Heather Graham, Justin Bartha and Jeffrey Tambor, and was produced by Legendary Pictures on a budget of US$35 million. The 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 inspired by the filmmakers' real-life misadventures, and was released in North America on June 5, 2009.
The film begins in medias res in Los Angeles with a bride, Tracy (Sasha Barrese), receiving a phone call from Phil (Bradley Cooper) who tells her that he and the other groomsmen cannot find the groom, Doug (Justin Bartha). Two days prior to the wedding, Doug and his best friends Phil, Stu (Ed Helms), and soon-to-be brother-in-law Alan (Zach Galifianakis) drive to Las Vegas for Doug's bachelor party. Tracy's father, Sid (Jeffrey Tambor), lends them his car, a silver vintage Mercedes for the trip. The four get a villa at Caesars Palace hotel and casino, then sneak onto the roof and make toasts to a night they will never forget. The next morning, the three groomsmen wake up in the suite with no memory of the previous night, soon realizing that Doug is missing. The suite is in severe disorder: a tiger is in the bathroom, a baby is in the closet, Stu is missing a tooth, one of the suite's mattresses is impaled on a statue outside, Phil is wearing a hospital bracelet, and a valet brings them a police cruiser instead of the Mercedes. While retracing their steps, a doctor at the local hospital informs them that they had traces of roofies (short for Ruphylin) in their blood, explaining their memory loss, and that they came from a wedding. They find the chapel, and learn that Stu, despite planning to propose to his mean-spirited girlfriend Melissa (Rachael Harris), married an escort named Jade (Heather Graham), who turns out to be the mother of the baby in the closet. In the chapel parking lot, they escape an attack by two gangsters. Confused, the men visit Jade's apartment and return the baby, but are arrested by two police officers who charge them for stealing the police car. The officers explain that they found the Mercedes, as Phil negotiates their release in exchange for their volunteering as targets for a Taser demonstration. They then retrieve the miraculously-unharmed Mercedes from an impound lot. While driving, they discover a naked man (Ken Jeong) in the trunk. The man attacks them with a crowbar and runs away. Alan then admits to spiking their drinks with roofies the night before, only because he thought the pills were ecstasy. They return to the hotel room to find Mike Tyson looking for his stolen tiger and listening to "In the Air Tonight". Tyson knocks out Alan and orders them to return the pet to his mansion. They drug the tiger with roofies so they can safely transport it in the back of the Mercedes, but it wakes up and destroys the interior of the car and scratches the side of Phil's neck. They push the car for the last mile with the tiger awake inside the car. Tyson shows them security footage of them stealing the tiger, in an effort to help them locate Doug. Resuming their search, the three are once again confronted by the thugs, who blindside the Mercedes into a pole. They turn out to be led by the man they found in the trunk of their car, a gangster named Leslie Chow. According to Chow, the groomsmen have $80,000 of his money, which they accidentally took the night before when Alan grabbed the wrong (and identical to his own) purse. Later that night, Chow went to get the money from Phil, and Phil threw him in the trunk, claiming him to be 'his lucky charm.' Chow demands it back in exchange for Doug, whom he has kidnapped. Unable to find the money, Alan uses his knowledge of card counting to win it playing blackjack. Later, they meet up with Chow, exchanging the money for Doug, but Chow had kidnapped a different man named Doug (Mike Epps), who turns out to be the drug dealer who sold Alan the roofies. The dealer realizes that he mixed up his drug bags and that he sold Alan roofies by mistake. With no other options left, Phil is forced to call Tracy and confess their failure. As Stu and "Black Doug" have a brief conversation, Stu suddenly realizes where Doug is. After stopping Phil and reassuring Tracy that everything is okay, they head back to Vegas. Stu tells everyone his theory: Doug must be on the roof of the hotel, since it was a similar prank that he and Phil pulled on Doug in the past, and that windows don't open in Las Vegas hotels. Stu deduces that Doug must have thrown the mattress to try to signal someone for help. Rushing back to the roof, they find Doug, weary and severely sunburned. They now have less than four hours before the wedding. Before leaving, Stu meets with Jade and the pair agree that they cannot remain married, but promise to meet the following weekend to see what develops between them. Jade also reveals that Stu had pulled out his own tooth on a bet from Alan. As they rush home, Doug reveals that he found Chow's $80,000 worth of casino chips inside his pants pocket on the roof. They arrive home and Doug marries Tracy, Phil happily returns to his wife and son, and Stu proudly and angrily breaks up with Melissa. As the reception ends, Alan finds Stu's digital camera chronicling the events they were unable to remember, and the four agree to look at the pictures only once before erasing the evidence. As the credits roll, pictures from the camera are shown.