i fell backwards off my mountain bike while doing wheelies on a recently paved (very high traction) road and hit head first. it split my head open, i was unconscious for about 10 seconds, and my entire shirt had soaked with blood as if you had jumped into a pool and blood was dripping off the bottom of the shirt. i staggered home dizzily and grabbed a wash cloth and put pressure on my head until the bleeding stopped. i just took it easy for a few days. i was too light-headed to do much.
now, the spot that i hit on the back of my head is a bald spot the size of a US quarter.
just though i would keep the thread going in the wrong direction