New What Happens in Vegas Trailer Is . . . Almost Kinda Funny To be honest, I'd sort of brushed aside the Ashton Kutcher-Cameron Diaz rom-com What Happens in Vegas because from the trailer it struck me as vapid and charmless. This new trailer, however, is slightly better, I must admit. Diaz tiredly steps back into her kooky-goofball-hot-girl shoes as Joy, a woman who takes off for Las Vegas in a post-breakup getaway.