I ended up working in a different part of the machine shop today. As we stood in front of the huge CNC machine that punches holes in large sheets of metal, one of the guys said to me, "Watch out, this machine can throw metal back into your stomach. Pull your shirt up, Jimmy."
Jimmy pulled up his shirt and showed off a nasty looking scar at the bottom of his rib cage that ran from one side of his torso to the other. I grimaced, and then I got well away from this machine.
Then the guy who had just told me to watch out started laughing. Apparently, Jimmy's scar was from an old surgury and this machine doesn't periodically shoot metal sheets into your gut at all.
Just call me gullible.