The original hangover movie and arguably the best. Watch what happens when 4 friends go to Las Vegas for a bachelor party. Next morning they wake up ... missing one of them... and have no idea what has happened or what they got up to. They have to retrace their steps and find out what happened the night before. Very clever how it all gets pieced together and very funny finding out. Watch this one - then watch Hangover 2 & 3!!