Kellen Winslow JR. had a clause, but still decided to ride anyway. He'd never ridden before and started on a sportbike (can't remember which one). If I remember correctly he tried something stupid, wrecked, hit a curb and tore his ACL. He still hasn't played a regualr season down in the NFL. I love motorcycles, but if I have to choose between $60 million and bikes... well, the choice is pretty simple.