What can you say about a man who leaps from a helicopter over Manhattan without a parachute in the hope that by increasing his heart rate he'll transform into an iridescent lime-green behemoth so he can take on an even bigger behemoth? That he knows he's living in a computer-generated universe in which gravity is a feeble suggestion and nothing is remotely at stake, and that when he hits the ground he'll be replaced by a special effect. The Incredible Hulk is weightless-as disposable as an Xbox game.