Occasionally one of the US services will have accidental shooting at the range because hot brass from the guy the next shooting point over will go down some other guy’s blouse collar. Which makes him twitch reflexively, jerking the trigger and waving the muzzle around like he’s directing an orchestra.
A guy who used to work in DoD’s M-16 program told me these incidents had become substantially more frequent since the fielding of the M16A2 because brass ricocheting off the brass deflector tends to take a higher trajectory than off the non-deflector A1, and the higher trajectory makes it more common for the flying brass to make it to the next shooting point over.
I’ve heard of it happening at civilian ranges, too, but in those cases it’s usually some guy shooting himself at a range where there are screens between pistol firing points that flying brass can bounce off. He shoots, the brass ricochets off the screen and goes down his own collar.
https://myfox8.com/news/video-man-accidentally-shoots-himself-in-face-at-gun-range/
When reflexes take over, muzzle discipline goes out the window.
I had a hot .45 ACP empty go down the neck of my shirt on the range. I neither moved nor even squeaked. Cleared the pistol, dropped the magazine, set it safely on the tray, then shook the shell out of my shirt.
I still have a little semi-circular scar. But I didn't let down the family!