The Hangover (2009),

The comedy that spawned a dynasty, kick-started Bradley Cooper and Zach Galifianaki’s career and taught us to never, ever, under any circumstances, hold your stag party in Vegas. Following an epic bachelor party none of them can remember, three friends wake in their Caesars Palace penthouse to find boxer, Mike Tyson, a tiger, a chicken and a human baby, but no sign of the groom. As they try to piece together the events of the night before, they realise what they experienced was no normal sesh on the town, and what happens in Vegas, might not necessarily stay in Vegas...