Speed Round: What's the Best Cure for a Hangover?

What's the best thing about Sin City, and what's the best cure for a hangover? ET's Rocsi Diaz asks these questions and more to the true pros – The Hangover Part III stars Bradley Cooper, Zach Galifianakis, Ed Helms, Justin Bartha, Ken Jeong and Heather Graham – in a brand-new Speed Round. Watch the video for the fun responses!

Pics: Epic 'Hangover Part III' Poster and More

In theaters this Friday, the epic conclusion to the odyssey of mayhem and bad decisions finds Phil (Cooper), Stu (Helms) and Doug (Bartha) happily living uneventful lives at home. Tattoos have been lasered off, files purged. The last they heard from disaster-magnet Leslie Chow (Jeong), he'd been tossed into a Thai prison and, with him out of the way, the guys have very nearly recovered from their nights prowling the seamy side of Las Vegas in a roofie'd haze, and being kidnapped, shot at, and chased by drug-dealing mobsters in Bangkok.

Video: 'The Hangover Part III' Stars Get Serious About Journey

Alan (Galifianakis), still lacking a sense of purpose, has ditched his meds and given into his natural impulses in a big way. A personal crisis forces him to finally seek the help he needs, and who better than his three best friends to make sure he takes the first step? But when the Wolfpack hits the road, all bets are off as the guys must finish what they started by going back to where it all began: Las Vegas.