"How the heck did that happen?" Injuries

Many moons ago, when I was installing a 8" lift on my F-150 in my parents garage over a long weekend break from school I almost killed myself. Rushing to get it finished up, I had trouble getting the drivers front wheel on. I had to stack pieces of 4x4s under the jack to get the height I needed to get the wheel on. So as I'm doing my usual brute force way of doing things, I had my head in the wheel well between the tire and the fender and I was pushing the wheel on the stud. Missed one, the truck rocked, and fell off the jack. The truck came down and sandwiched my head, luckily the jack caught on something else and all I suffered was a really bloody nose and a fat lip.

Not so much a "how did that happen" story (young stupidity) but I like to share it for safety.