Left forearm,roller-skating down a very steep hill,hit a fist sized rock and KABOOM!!LOL,my arm was looking like the Zorro sign........Worst thing is I was in the middle of the road,praying a car wouldn't crash into me,I was s**t scared.......LOL I was only 9 though........I probably shouted for ten minutes for someone to come 'rescue' me........Superman never showed up.......Bastard!!!