Four old buddies (Michael Douglas, Robert De Niro, Morgan Freeman, Kevin Kline) gather for a bachelor party in Las Vegas for the last one to marry, where they unpack ancient baggage in the course of proving there's life in the old boys yet. Indeed there is, and writer Dan Fogelman and director Jon Turteltaub should thank God for it. Without these guys—plus Mary Steenburgen as a lounge singer who befriends them—the movie would be less than nothing. (It's hard to believe that this wheezing retread of The Hangover came from the man who wrote the marvelous Crazy, Stupid, Love.) Douglas and De Niro add some dramatic heft while Freeman and (especially) Kline handle comic relief. Steenburgen blends right in, and has a nice singing voice, to boot. Joanna Gleason adds bookend cameos as Kline's wife back home.