Mine was in a steel foundry when I was 21 years old. Third day of work I showed up for swingshift and was told to go home as they'd had a 20,000 lb. ladel break a bail while heading down the floor hanging from a bridge crane. The result was hot metal pouring out as the crane operator tried to get it to a pit to control the spill. In the process three men were covered in molten steel and killed instantly!
I should have quit that day, but instead I was back at it three days later, and stayed there 7 years. I saw an opening for an apprentice electrician at the foundry, and got off the pouring floor. Once I turned out as a journeyman electrician I quit, and went elsewhere.

Me too...First job as a pattern maker was in an aluminum foundry in Southgate, CA back in the 70's.There was a line of furnaces aong the eastern wall of the building I was warned to stay well clear of as the guys out there were not as careful as one could wish.

Sure enough one new guy went to the water cooler and on the way back to his station decided to toss the paper cup of water into an open furnace to see what would happen...Killed him and three other guys were badly burned.I got out of there pretty quick and went to work in the model shop at Northrop.