In elementary we boys had a past time of jumping off the swings at full tilt, launching our 80lb frames a good 20 feet into the air before landing in the sand. Our school had a rule that if you stood in front of a swing and counted to a hundred you could claim the swing. One day some punk kid started counting down my swing, so I told him to move as I was gonna launch. Punk wouldn't move so I told him again, he stood there like an idiot as I lifted off and knee dropped him from 20 feet up. Gave the poor bastard whiplash from the collision. I thought I was gonna get expelled but nothing ever came of it.