At the risk of outing myself, shush if this reveals who I am..
I have..
Fallen backwards, turning my knee over, down some stairs landing bum first in a cat litter tray (the covered kind).. i had to crawl out which was hard as the door opened inwards into the space i was occupying..
That did some serious muscle and ligament damage to my knee with some impressive bruising.
Broken a rib coughing. A week later I coughed again and fell off the sofa in agony, the paramedic reckoned I'd done another (And the subsequent xray to check things proved him right).
My absolute stunner though was test driving an all terrain power wheelchair, taking it up a steep earthy mound... and it tipping me out face first down the other side, landed on knees and hands, big fat bruised knee and some cuts, but I had to haul myself up and laugh as the sales person was absolutely crapping himself thinking NO SALE!
I bought the wheelchair :D