About 15 years ago I was restoring an Alfa romeo 1750 GTV series 1......I was using an underbody paint gun, the guy that leant it to me told me it blocks from time to time and the way to clear it is to hold your thumb over the end and pull the trigger. I had seen him do this a few times so didn't think much about it. So it gets to the time when the gun blocks and I try the unblocking trick...the gun fires underbody paint into my face..up my nose and in both eyes! it winded me and I couldn't see anything....scary!
Lucky for me someone was outside the shed and heard me shout..the nurse at the hospital was not amussed, she had to wash my eyes out with plaster remover. Very lucky escape.
The other nearly dead accident was when I was looking for play in the steering rack of a delorean....I had the car on its jack and removed the front wheel. I climbed under the front but couldn't quite get my head up into the area where I wanted to look, I got out from under the car to lift it some more. Half a turn on the jack and the screw snapped and it fell to the floor....now that was lucky.....and stupid.