Yeah, I've been hospitalized and institutionalized quite a few times so I guess I'll share one of my stories, I was about ten years old, was outside riding my bike and there was this really steep hill in our neighborhood that I used to ride down all the time, one day when I rode down the hill I was about halfway down when a car started backing out of a driveway and I didn't notice it plus, I was going too damn fast to hit my breaks or I'd tip over because of the angle of the hill, I slammed RIGHT into the side of that car and flew off my bike, I cut my knee on something and landed on my back, my head hit the ground pretty hard, the driver got out and called for help and I was laying on the ground crying like a bitch, luckily I didn't have any major injuries but I had to get stiches on my leg, not sure how many though.
TL;DR: Don't ride down steep hills in your neighborhood at a high speed.