I was riding a familiar section of single track on my mountain bike Saturday afternoon. Going downhill at moderate speed when all of a sudden I was on the ground with my helmet grinding along the gravel-strewn trail. Aside from some minor abrasions and torn Lycra, I was fine. My helmet was another matter -- it was destroyed. I tried to imagine that damage to my head had I not been wearing a helmet. At best I would have been in ICU with a traumatic brain injury and at worst... Oh, and the bike was fine.
If you want to see what happens to your head hitting the ground without a helmet, try dropping a cantaloup from an 8-foot step ladder. Guess I just became the new "poster boy" for bicycle helmet safety!