For Tony Hawk, it wasn't enough to skate for two decades, to invent more than eighty tricks, and to win more than twice as many professional contests as any other skater. It wasn't enough to knock himself unconscious more than ten times, fracture several ribs, break his elbow, knock out his teeth twice, compress the vertebrae in his back, pop his bursa sack, get more than fifty stitches laced into his shins, rip apart the cartilage in his knee, bruise...