I'm dreadfully accident prone!
Bike related, had a couple of accidents in my youth where gonad+stem interface caused tremendous pain at the time but little did I know how much damage I had caused till I came to have a vasectomy many years later (wasn't preventing the buggers from working altogether) Cue sitting in the vasectomy factory with every single duty doctor coming in to fondle my nuts to try and separate my Vas from all the scar tissue I had created earlier in my life! 7 doctors standing there fondling me one at a time was too much! In the end I had it done under general anesthetic in the end!
Non Bike related,
I had my neck broken whilst rugby training in the forces with telegraph pole races along the gym. My partner on the other end dropped it, I found out when it hit me on the head, then just like Jerry in the Tom & Jerry having it hit me a further 6 times as it bounced up and down on my head! I ended up paralysed down my right hand side at the one end of the gym crawling about and 30 Army Rugby lads pissing themselves at the other!
There are more!