only 2 things comes to mind
as a kid, i had those bunkbeds and my favorite thing to do was sleep on the top bunk because I thought it was cool. i had done this multiple times before but if i didn't feel like climbing down the ladder, i'd just jump down to the floor without issue. for whatever reason, this one time that I did it. I may have either landed wrong or my foot rolled as I landed on the floor and managed to sprain my ankle. so, like a kid, I screamed and cried for my parents and they took me to the hospital. had to walk in crutches for a bit, shit sucked at school because any time we would go somewhere that required a line, I was always lagging behind because it's fucking difficult to walk at a speed with crutches.
one time I was working a fast food place and I managed to slice my thumb open when not paying attention cutting a chicken sandwich. after everything was said and done, I got $700 out of it and a scar that isn't completely visible unless you were trying to look for it. probably wouldn't do it again but it was a nice pay increase, few days off work, and i still got to keep my thumb.