Fell down the basement stairs over the side from the top onto a concrete floor when I was about 8. Was knocked out for several hours. Several people will swear this has had a lasting effect on me ;)
The best one was my brother: We were in the den watching TV when he was around 9, he had the hiccups and decided to hold his breath to get rid of them. He passed out, hitting the stone fireplace hearth. I was across the room and told him to stop joking around until he stood up with blood gushing from his chin. I was maybe 13 and the only other person home was my semi-lucid grandmother. This was before the days of 911. Finally found a neighbor's maid who drove us to the hospital. They wouldn't do anything until one of my parents got there which was about 1.5 hours. They both walked in and fainted, lol.
He had plastic surgery but still has a nice scar to remind him. Chipped a few teeth too. Needless to say, we always tell people NOT to hold your breath when you have the hiccups
