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Boeing could use some of these right now. Only updated...
Actually saw this happen to a kid in shop class in high school. Football player dressed up for homecoming. Knurling a tool handle. The teacher heard him scream and casually went over and stopped the lathe as his head got about 3" from the chuck. Left him there while he explained why this was a bad decision and asked what would have happened if he'd actually been turning something. He walked away and went into his office, got a pair of scissors, and cut the kid's tie off to free him. He could have had a lesson right there on how to reverse the lathe but I think his approach was the best!