I was shooting a stainless steel .45 I used to own, at the range. Infernal gun. It jammed in half recoil, so while carfefully keeping the muzzle down range I grabbed the slide with my left hand and tried to force it back and forward. Then I noticed that my index finger was neatly curled over the end of the barrel.
Models wise probably with a knife, like you say. Burned my left forearm on a soldering iron on the bench.
One time at work back in the day, in the drafting room, I was drawing and smelled strong chemicals. I looked up and the guy whose desk faced mine back to back was cleaning his drafting surface with a rag and a can of acetone, with a cigarette hanging out of his mouth.