I'm laughing right now, because I first started having unpredictable injuries in my mid-20s. The funny thing is that, with one exception, it WASN'T while I was doing something you'd expect to get injured, such as Jung Sim Do. I'd be, instead, walking downtown with my friends, trip over a bicycle chained to a rack, and get a giant goose-egg on my shin.

The main difference is that, back then, those injuries could actually be expected to eventually heal.

My sympathies on your paperwork injury. That sounds like the time I was pregnant and bent over to help my cat onto my lap, pulling out my side!