I've always been pretty injury prone and have had a number of stupid injuries. Broke my wrist as a kid by jumping over something in the wet grass and upon landing, I tried to catch myself with my right arm. Shot that summer all to hell.
In high school, I had my forehead split open by an elbow while playing a pickup basketball game in the gym during lunch. Two days later with the stiches in my forehead above one eye, I was cutting through the weight room between classes, came around a corner and caught bar from the pull down weights that the guy ahead of my had just swung as he was passing by, just above the other eye requiring stitches. For the next week, I looked like I had lost a heavy weight boxing match, badly.
While helping a buddy with some construction, shot my index and middle fingers together with a 16 penny nail from a nail gun when the gun jumped back after the first shot, hit the wall behind me and came down on the boards I was nailing together causing it to shoot again, this time missing the boards and proceeding down and through those fingers that I was using to steady the two boards. As I was embarrassed by that move, I quietly removed the nail with a pair of pliers, wrapped them up with a rag and went on with what I was doing. A few mins later my buddy yelled, "Were did all this blood come from" looking at me and quickly figured out what happened. He tried to take me to the hospital, but I said all they would do is bandage it and send me home.
There are many other stupid injuries, but those are the ones