I was sixteen used to ride BMX with my friends. We were having a height contest on one of the jumps and it was my turn to go I was riding around the berm, hit the takeoff then blacked out in midair. Woke up about a minute later on the ground, tried to get up but couldn't move my right arm, friends helped me up called my mom, went to the hospital got X-rayed. Had to wait a week until surgery.