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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 to occur mere hours away. The film stars Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, and Heather Graham. The film was released in North America on June 5, 2009 to critical praise and box office success.

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 to occur mere hours away. The film stars Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, and Heather Graham. The film was released in North America on June 5, 2009 to critical praise and box office success.

Doug is about to be married, so his friends — Phil, a schoolteacher bored of the married life, Stu, a dentist planning on proposing to his strict and controlling girlfriend of three years, and Doug's soon to be brother-in-law Alan, who is smart yet socially-inept — take him to Las Vegas for a bachelor party. Stu's girlfriend constantly checks in and calls him, thereby forcing Stu to lie to her about their destination.

The guys get a suite at their hotel, then sneak onto the roof of the hotel and toast to the night ahead. Skipping forward to the next morning, the three groomsmen awake with no memory of the previous night. They realize Doug is missing, Stu lost a tooth, there's a tiger in the bathroom, a baby in the closet, and the villa's a wreck; filled with all the activities and things they engaged in the night before. Initially they believe Doug to have gone out for breakfast, but soon worry when his cellphone has been left behind. They collect what memories they have from their little amount of memory to figure out what might have happened to Doug, with Alan finding Stu's tooth in his pocket, Stu finding an ATM receipt for $800, and a VIP parking pass. The valet brings them a police car, which they had dropped off the night before.

Suddenly discovering that Phil is wearing a hospital bracelet and implying that he may have been there the night before, the guys head to the hospital trying to obtain a lead and follow the potential trail that they left behind in their drunk escapades. The doctor identifies that they had traces of Ruffalin, or roofies, in their blood, helping to explain their memory loss of the night before, and tells them that they had just come from a wedding, to which he provides them another clue. At the chapel, they learn that Stu had married a girl named Jade at some point in the night, to which he freaks out about and looks to annul the wedding, but Eddie, the owner, tells them that they need to find Jade so both parties are present to complete the annulment. In the parking lot of the chapel, however, they are attacked by two Chinese thugs. After smashing through their car after they draw a gun and end up shooting Eddie in the shoulder, they escape and track down Jade, where she reveals she is a stripper and that the baby is hers. After obtaining a few more details about their night, cops then burst into her apartment to arrest the three men for stealing their car. However, not wanting to face the embarrassment of losing their car, the officers work out a deal in which the men volunteer to demonstrate how tasers are used in the middle of a tour of the police station with a group of children. Afterwards, the three friends pick up their car, though a Chinese man named Mr. Chow is locked in the trunk naked and attacks them upon his release. Alan then admits to having drugged their drinks the night before with what he thought was ecstasy, hoping they would have a better time, but realizes he must have been sold roofies instead by the drug dealer he purchased them from.

They head back to the hotel to look for further evidence, but discover Mike Tyson instead, who is the owner of the tiger in their bathroom. He forces them to bring the tiger back to his place, and on the way there it destroys their car after waking up from the roofies that Alan put into a steak to feed the tiger, which they're then forced to push to Tyson's home. After returning the tiger and watching a security tape from Tyson's security cameras of their activities from the night before (and learning Doug was still with them at that point in the night), they are attacked again by Mr. Chow and his men after they run into their car and severely damage it. According to Chow, they had mixed up bags the night before at a casino, and they were holding $80,000 of Chow's money that he had won. Chow demands it back in exchange for Doug, whom he has apparently captured and taken for ransom with a sack over his head in his car. Unable to find the money, Alan decides to use his knowledge of counting cards to win the money in blackjack. After a night of playing blackjack and gaining suspicions from the casino, the boys manage to obtain $82,400 in winnings, and feel reinvigorated at finally being able to get Doug. The money is returned, but Chow had captured a different Doug than the one they're looking for, who turns out to be the drug dealer that sold the roofies to Alan, who then realizes that he mixed up the drugs by accident when he sold them to Alan.

Phil is in the middle of calling Doug's fiancée to tell her they lost Doug, when Stu realizes where Doug is. The guys had seen a mattress flung from their hotel earlier, and Stu deduces that Doug is locked on the roof. They find him, sunburned but holding on to the original $80,000. They rush back home and make it to the wedding just in time. Phil happily goes back to his family, while Stu breaks up with his girlfriend and arranges a date with Jade. Stu learns from Jade that he had pulled his own tooth out as a bet. The four friends reflect on the trip, and when Alan finds a camera they had with them, they look at the images from the night they had forgotten, which then roll over for the beginning of the credits and ends the film.