I had a similar experience with an ATV about three years ago. Much like Alyss, I was driving on a road and went to turn around, landing in a smaller ditch. My ATV went to roll over, and my first instinct was to jump off of it the opposite way, so I was unharmed. I don't ride ATV's anymore, although my dad and siblings use them on their hunting trips.
As for actual injuries, I fell and cut my knee in kindergarten, requiring stitches...I attempted to do a cartwheel on my trampoline when I was about ten, jamming my middle finger of all places...then I jammed the exact same finger playing dodgeball in 10th grade. But I have never actually BROKEN a bone, knock on wood.
Then just this week, my new puppy Rosie decided to get crazy--she loves to try and lick you, and she lunged at my face when I was playing with her and bonked my nose HARD. I was expecting it to start bleeding, but it didn't. And just yesterday, she got so excited and tried to attack my hand, scraping one of her teeth on my hand. Ouch.