WATCH: 'The Hangover Part III' debuts teaser trailer

With no wedding or bachelor party in sight, it's hard to imagine what could possibly go wrong in the latest installment of "The Hangover" saga. For Part III, subtitled, "It All Ends," the Wolfpack hits the road one last time and, as always, they're in for a crazy ride.

Starring Bradley Cooper, Zach Galifianakis, Ed Helms and Justin Bartha, and featuring the hilarious Melissa McCarthy, "The Hangover Part III" premieres on Memorial Day.