We often have heated discussions about the benefits of wearing bike helmets (most recent here) but Ryan Lipscomb of Madison, Wisconsin is alive to tell of a truck running right over his head. "I didn't see it coming, but I sure felt it roll over my head. It feels really strange to have a truck run over your head." The truck just kept on going, as they so often do, usually saying that they didn't know they hit anything. The police and Lipscomb think otherwise: "The truck driver definitely would have known. You know when you run over a curb and my head was definitely higher than a curb." Moreover, Lipscomb said, he was already in the street as the truck was turning. "He had to have seen me."