over the past week or so i've seen at least three guys riding w/o helmets. i'm not talking about the guy on the Next heading to his job, i mean full-on roadies riding w/o helmets. what gives? i hardly get on a bike with my kids w/o a helmet and yesterday this guy is railing down 206 behind a car w/o one? so, do you always wear a helmet when you ride and if not, why?