The Hangover [2009] Code: https://www.imdb.com/title/tt1119646/ (107mins) A Las Vegas-set comedy centered around three groomsmen who lose their about-to-be-wed buddy during their drunken misadventures, then must retrace their steps in order to find him.
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The Hangover Part II [2011] Code: https://www.imdb.com/title/tt1411697/ (101mins) Two years after the bachelor party in Las Vegas, Phil, Stu, Alan, and Doug jet to Thailand for Stu's wedding. Stu's plan for a subdued pre-wedding brunch, however, goes seriously awry.
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The Hangover Part III [2013] Code: https://www.imdb.com/title/tt1951261/ (100mins) This time, there's No wedding. No bachelor party. What could go wrong, right? But when the Wolfpack hits the road, All Bets are Off.