Broken neck and back riding a bicycle (roadie/amateur racer) into two SUVs that were crashing in front of me. I took a 30mph hit directly to my head with nearly the entire force of my body into my forehead. As a reference, at sea level, a person diving from a ten story building would have a similar velocity hitting the ground head first. I was told I only survived because I was initially unconscious for 3 hours as the damage to C1 and the base of my skull would have been fatal if I had moved substantially before the swelling had time to build pressure.