Okay...my war story. Riding with a friend south of town, coming off a hill and spinning the big ring. Got a bit too close to my riding partner and touched his rear wheel. Next thing I know I am on the ground. Went to the emergency room and got 40+ stitches in the mouth area. Palms nicely torn up, shoulders badly scraped. All this with no helmet, so I was real lucky. I can still feel the scar inside my mouth and as recently as 5 years ago worked a small piece of gravel out of the scar tissue. I had keloid scars on my shoulders that finally disappeared in the early 90s.