Mostly just old age gets me now, but as a child I was known for being accident prone (also called poor decision making). My two crowning glories would have to be:

1. Had a small toy basketball ring that I'd stuck to the full height windows in the lounge room. Stepped up on the window sill for the dunk (in socks) slipped and put my knee through the window - the glass only went in to my knee a few centimetres and I lucked out with only needing about 8 stitches.

2. My brother and I wanted to see how far we could stretch an old tennis trainer, literally a heavy weight attached by elastic to a tennis ball, turns out it was quite far. My brother let go of the tennis ball when I wasn't ready and it hit me square in the eye. That put me in hospital for a week or so with a detached retina, thankfully I was doing enough that it reattached itself, though wearing a patch for a few more weeks was not fun.