It's probably safe to say the ground doesn't count... having a car door slammed on my head wasn't fun, but I have to say by far the worst was being struck in the forehead with a spade shovel. I got the pointy end of it, and it damaged my skull and I needed 8 stitches or so. I was 7 or 8 when it happened, and there are no visible signs of scarring left, but there's a dent in my forehead I can still feel today.
