As lightweight as a ping-pong ball, this charming, slightly over-extended comedy sends up films about showbiz rivalries. It's set almost entirely in Las Vegas, the stamping ground of Burt Wonderstone (Steve Carell) and Anton Marvelton (Steve Buscemi), a pair of successful but complacent magicians, friends and collaborators since childhood. Suddenly their overfamiliar act is challenged by a new, more dangerous act performed in the streets by Jim Carrey and broadcast online to a worldwide audience. Burt and Anton break up and drift in different directions until they rediscover in an old folks' home the maestro of traditional abracadabra (Alan Arkin, the master of deadpan comedy), who inspired them as schoolboys. All four comics are in excellent form.