He was crossing wet railroad tracks that crossed the road diagonally and he was slowing for a stop sign on the other side. Sure enough, down he went. He popped up off the pavement pretty fast and then he took off his helmet and slammed it down in frustration in the ditch! I stopped to check on the 20-ish rider and he was mostly ok except for a sore, bleeding knee and ripped jeans. I picked up his helmet and it was obvious how the helmet had hit the pavement, undoubtedly saving him from more serious injury. When I suggested that he should be nicer to his helmet because it was really good to him, all he did was shrug his shoulders and say "Yeah, whatever." I hope he learned something today.