I have a few from myself and various family members.
Me: I was walking in front of my sister who was on roller skates. i was in 3rd grade. She started to fall and grabbed me, but accidentally pushed me forward. I went smack-down right on my face and broke my front tooth right in half. This darn thing has plagued me ever since. Caps, crowns, root canals, failed root canals, and judging from the pressure I'm starting to feel occassionally now, I'm sure I have about another $10 grand to have it removed and an implant put in. There's probably no saving it at this point. over 30 years of dealing with the darn thing, and it wasn't even ME on the skates!
Me: Broke the heck out of my ankle when I was carrying DD down a 3-step landing when she was 9 months old. I turned back to grab something on the shelf, forgot and thought I was already on the last step, and stepped out instead of down. Saved the baby, sacrificed the ankle. There's always that "split-second" before the pain really sets in where all you can think is "I'm OK....I'm OK...." then "Nope. I'm not OK!" I was on crutches for 2 months, trying to take care of a baby and a 4 year old. Not fun!
DH: Broke his ankle so badly he needed surgery to put a plate and screws in it when he was running across a parking lot with icy patches at his work. His important Mission? To get donuts for everyone from the bakery next door. LOL His foot started sliding on the ice, then stopped and buckled with all of his weight once it hit a dry spot. He heard it crack and everything. It took months to heal, and he had to go to PT for a long time to learn to walk again.
My dad: threw his back out stepping out of the shower, landed on the floor, and gave himself a concussion hitting his head on the way down. Oy! I was about 8 years old at the time, and still remember his painful yell!
My Aunt: gave herself a bloody nose and black eyes when she threw up the bear blanket my uncle had made of out of a bear he got while hunting one year. Up went the blanket, and down came the bears face, right on her nose.
My DS16: We were relaxing at a lakehouse when he was about 7 or 8 and my sister's in-laws were there too. Her niece was fooling around with child's fishing pole, cast it backward and hooked DS16 right in the leg. So disgusting trying to get that bloody thing out of him! Sigh. And the craziest thing was, the 7 year old girl who did it to him screamed louder and longer and more hysterically than DS did, and HE was the one with a fishhook stuck in his leg!
My sister: we were all camping last summer together, and were on our way to a river-tubing excursion. We all pulled out and were following each other to the site. All the sudden my sister and her husband pull up, the kids get out of their car (they are 8 and 3) and into my other sister's car, and they take off. Turns out, my sister stopped at the little outhouse bathroom near our campsites on the way out of the campground, and stepped off the step to get into the bathroom, and slipped. She tried to catch herself but instead ended up breaking BOTH ankles. She literally broke both of her ankles while tent-camping, 3 hours from her house, in the middle of nowhere an hour away from the nearest hospital, coming out of an outhouse. Thank goodness she was with her 4 sisters! She decided she didn't want to go home early, so they stayed the rest of the week and we took good care of her the rest of the time we were there, and helped her with the kids. I felt so bad for her!