This crap happens all the time. I used to sell air nail and staple guns for the manufacturer. I remember hitting a job site of a framing crew. 9 times out of ten, these dudes still had a load on from the night before and a few hard core dudes were just cracking one open at 9AM. I was talking to the guy running the site when one of these geniuses nailed his foot to the floor laying down sub flooring. Somehow he missed bone. What a jackass.
I know a carpenter that nailed his p***s to his leg. His young helper laughed all the way to the hospital. Actual, I had a good laugh when I heard too. I have a framing gun now, and I respect it big time.