Dont do 3 weeks of night shift, then start your car with only your left leg in the car (on the clutch) after only a couple of hours of sleep, and forget that on this one occasion, you left your car in gear on your drive when you parked it up, to warm it up before trip out.
Result was the car tearing down the drive way, with me hanging half out of it, the open door smashing into the corner of the house, trapping my leg and pushing it into the metal loop that locks the door, just below my knee, as well as dragging my foot along the drive, removing quite abit of skin on the side of my big toe.
I have no idea how i managed to get in the car, but managed to bring it to a stop before it hit the house opposite the drive way, before the gates ripped my wing mirror off. After reversing the car back onto the drive, looking at the surprisingly small amount of blood, I got out, looked at the car, then went into the house, dropped my trousers, and discovered a 15mm wide x 40mm long hole in my leg, just to the side of the vertical bone that is attached to the knee.