I had let a 6.5 gal glass carboy sit overnight with bleach water overnight. The next morning, I dumped the water and began to carry it up the concrete stairs to the back door of the house. Halfway up, I stumbled and fell. I tried to catch myself on the railing to keep from landing in the glass, but couldn't stop myself in time. My left hand came down and when I lifted it up, it started pulsing out blood.
I went to the ER, where they stitched me up and referred me to a plastic surgeon. Two days later, I met with the surgeon, who told me that I had severed the major nerve in my left thumb and one of the major nerves in my left index finger (along with the muscle that draws the thumb to the little finger).
A week or so later, I was in surgery where he sewed my nerves and muscles back togeter. I spend the next 5 days in extreme pain and on very powerful pain killers. I was in a cast for 3 weeks I think (I don't remember off the top of my head) and then I had to be careful with it for the next 2-3 months (no lifting or strong grasps).
That was ~3 years ago, and I still haven't recovered completly. I have some feeling in my finger and thumb, but not much. After the accident, I switched to plastic carboys and never went back.