I was helping my dad set up our pop-up camper the summer before my freshman year of high school (almost 7 years ago). The electric jack stopped working, so my dad got out the hand crank. After cranking for a while, he let go for a couple of seconds. The crank (which was a metal rod about 3 feet long) shot into the air (clipping my forehead on its way up), flew over the camper,and landed about 50 feet away. Spent about 3 hours in the emergency room waiting to get stitches. Let's just say that if I was as tall then as I am now, that crank would have probably punched through my skull.