My worse injury to date was when a zombie ate my brain, but we're talking about shop injuries.
I severed about a 1/4 of my left thumb in 98', I think. Maybe 97'. In any case, I was trying a new all purpose blade on my tablesaw, cutting neck billets. I was awake and clear headed, but my safety protocol was bad. My thumb was in the direct path of the blade and I pushed straight through. Funny thing is, I didn't realize that I had been hurt for a while. I heard the bone snap, which I thought was a knot in the wood, so I reached down to turn off the saw and inspect the table. Holy crap! My thumb tip was hanging by a shred of skin. I literally could have cut it off with a pair of scissors. I immediately wrapped my shirt around it and walked over to my brother, who then drove me to the emergency room.
Once I got there, I had to wait with a bloody hand wrapped in my shirt and a rag for about 30 minutes, before they could see me. In the prep room, the nurse gave me some local anesthetic and proceeded to inspect and clean the injury. Once the drugs kicked in, the pain became a lot more bearable and I watched intently as she cleaned up the wound. It was kind of funny. The nurse told me that she's never had a person smile and ask questions as they have their partially severed limb cleaned.
Then, I waited for a surgeon to arrive for 4 hours. Turns out that there's only a handful of reconstructive surgeons on Oahu and it was a busy day. Unfortunately, the tip couldn't be saved. Normally what they would do is shorten the digit and pull the skin over, but the thumb is special. Since it's already shorter than the other fingers, he decided to graft skin from my belly over the tip. My brother and I thought he was joking, so we added to the mix and asked if my hand could be stitched to my ass. We had a good laugh, then saw that the doctor was not joking. I opted for the belly. It was a full skin graft, so my thumb had to be sewn to by stomach for two weeks, until the capillaries connected.
I got bored as hell staying at home. The only thing I could do was watch tv. By the third day, I ignored my doctor's orders and headed back to work. Technically I wasn't supposed to be there, but I'm family, so bleh. I was able to use the surface sander and do other one handed operations, which was much better than rotting away at home.
While I wouldn't choose to cut off any more of my body, it all turned out okay. Since the tip is missing, I can't pick up small or flat objects easily with my left hand, but it's otherwise 90% functional. I can still play my uke, thank God, and do pretty much everything normally. When I got the worker's comp insurance check, I bought my first computer and went to Japan. I still had a sum of money saved, which I used a few years later to buy my wife's engagement ring.