Finished the GA State USPSA match. Place third revolver and 1st C class. (Yeah, yeah. 3 revolvers only on in C.)
A friend of mine, Carmen Lout, had an interesting thing happen. Shooting .40S&W in Limited, a round didn't chamber. As she racked the slide to clear the round out, the nose of the bullet caught on the slide and the primer was jammed into the ejector setting it off.
The bullet caught her in the mouth. Just a swollen lip. The RO signed a target saying she was excuse from work because she had been shot.

Never heard of this but boy keeping you mouth shut and wearing eye protection is obviously very important. I have no doubt she has the strength and speed to do this as she's a body builder.
But here's the part I wonder about. It was ruled NOT an ND, because the round wasn't in the chamber. The gun, in essence, didn't fire a round. She was not DQd My thinking is that whether in or out of the gun it was a "discharge" of a round while under the control of the shooter. It created a hazardous situation. I don't wish a DQ on her, just wondering how often this happens and the thinking behind the ruling.
Video:
https://player.vimeo.com/video/617082244