It's funny that Ashton Kutcher and Cameron Diaz's new film is called What Happens in Vegas. It implies the usual counterpart to that line, "...stays in Vegas," but sadly the film doesn't take its own advice. This movie should have stayed in the film reel, or in the writer's head, or in Ashton Kutcher's pants, or any other place it didn't have the opportunity to enter the collective American consciousness. If there's anything we don't......