How to recover from a night out so crushingly awesome you can't remember a thing about it? 1) Account for all your friends -- leave no man behind, unless he begs you to. 2) Empty your pockets: a matchbook may provide a clue as to your travels, as could an ATM receipt or one of those little plastic bracelets you get at the hospital. 3) If you can't find your pockets, check to make sure you're wearing pants. 4) See The Hangover, in theaters June 5th. Chronicling the misadventures of a Las Vegas bachelor party gone wrong as they woozily search for the misplaced groom, The Hangover is helmed by Old School director Todd Phillips and stars Bradley Cooper, Ed Helms, Zach Galifianakis, Heather Graham, Justin Bartha, and Jeffrey Tambor. To bring you to a state of freakishly jittery anticipation, we've posted a sweet trailer (see above), which might or might not involve a tiger, the vocal stylings of Mike Tyson, and a missing tooth. Watch the trailer, and love it as much as you love your missing friends, and missing pants.