One time, I slipped and fell. My ass landed on my hand, and I sprained my wrist.
Then there was this one time...*pauses*...okay, I did it two times...I was running back into the garage because I forgot something. I had hit the button to open the door and reached it while it was still opening. So I wouldn't have to stop running, I ducked down, but I didn't duck down far enough. I cracked my forehead on the bottom of the garage door and fell on my ass both times, landing once in a yucky puddle.