Worst injury:
I sliced through all the extensor tendons on my left wrist with a miter saw.
Near-death Experience:
I came real close to being killed in the Navy when the guided missle cruiser I was on ran aground as we were leaving Yokosuka harbor. The collision ripped the sonar dome completely off the ship, and tore a gash down the starboard side of the hull and was just 1 frame away from exposing the engine room to the sea. If it had reached the engine room, the ship would have blown sky-high. On top of that, our berthing compartment was just a few frames aft of the sonar dome, and the hatch leading to the compartment below us wasn't dogged down all the way.
As water rushed into that compartment, the air needed some place to go, and the hatch gave way. It blew open so hard that it dented a two-inch thick steel bulkhead. It too me and three other guys to wrestle it back down and to dog it properly. The water was just inches from coming up through the hatch when we finally got it secured.
We limped back to port, and got put in dry-dock (I have pictures somewhere, I'll see about scanning them onto the computer). It took about 45 days to get a new sonar dome and fix the damage. Amazing part - nobody was killed or injured (but the captain's career was over).