Osteogenesis Imperfecta [http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002540/] (brittle bone disease for short). I don't have it very severely, I can still walk around and do normal people things, but if you were to perform even a light bro-tap on my shoulder or something my bone will bruise up.
As far as events go, the worst of it was this one time last year I was outside at night, and I just tripped over a small little exposed property marker on the lawn.
Most people would wipe the dirt off their knees, but I managed a shattered kneecap, a cracked femur, a tibula that snapped like a twig, and to top it off, a stray fragment cut up a bunch of my nerves.
I was stuck in a bed for about 3 months. Then was put in a wheelchair for another 3, then crutches for a month, then rehab for another month. And it still didn't even heal correctly.
Stuff like that has happened a few times, but it was then I collectively decided "fuck outside" and started playing more video games. It apparently gives me these sweet blue-tinted scleras though, makes me feel like I have some kind of side effect for super powers.