These threads always cheer me up.
Luckily never had any major injuries, obviously had the old ball into the nuts, but no-one can call himself a complete man if he's not experienced that, had a strange ear infection that resulted in sever pain and popping sounds for a day, and a scar from sliding over the head of a nail, sticking out of some floorboards on my knee, but that's about it.
Most cringeworthy experience was when i had an ingrown toe-nail and the chiropodist guy decided to cut away half my nail with a scalpel without an anaesthetic. There was absolutely no pain involved, but feeling the pressure he was putting on the nail (his hand was shaking with the pressure he was putting on it), millimetres away from my swollen, red, infected, and sore as hell toe, was one of the most unpleasant experiences of my life, it sounds minor and really it was, but just the thought of a scalpel makes me shudder now.