The Hangover (2009)

After a wild bachelor party in Las Vegas, Phil, Stu, and Alan wake up with no memory of what happened the night before. Their hotel suite is wrecked, strange clues are everywhere, and worst of all, the groom is missing.

With time running out before the wedding, the three friends retrace their steps across the city to figure out what went wrong. Each discovery leads to another outrageous twist, forcing them to piece together the events of the blackout night and find Doug before it is too late.