the usual ones...
1. M1 thumb when in high school;
2. sliced my RH web with the stock 1911;
3. the recoil/scope slice once (off a .223, no less!)
4. the HBD (Hot Brass Dance) more than a few times; and
5. Blowing up my Glock 20--arguably the first one in the U.S. to have done so. (This was about the time magazine reports of Polygon (?) rifling and lead bullets maybe being a problem in Glocks were just starting to surface--1991?) But I'd been shooting 1000s of reloads in my SA 1911 10mm (Peters Stahl slide, polygon barrel for over two years, with no issues....)
After 200 rounds of FMJs to burnish the barrel a bit, I shifted to my 10mm reloads (180 gr. lead, about 5.0 gr. of 231 as I recall). At about round 274, at a local indoor range, in a more-or less standard rapid fire drill, I suddenly felt a stinging in my right hand--and realized there was no slide on the receiver.
About the time I'm digesting this, the RO shut down the range--he'd heard a loud, loud KLANK as the slide hit the radiator sheetmetal cover about six feet behind me (but not the window directly above it).
The chamber was split at the 4:00 position, about 1&3/4" long. The slide was massively twisted and deformed with the barrel locked in it, but the receiver looked OK. Meanwhile, I was looking over the knuckle and first joint of my RH forefinger. It felt badly sprained, and a blood blister was forming. The shooter two stations over was an MD, and he concurred that it appeared not broken--and it wasn't.
The RO, MD, & I spent some time looking over the pieces and realized how much that frame had to flex to let the slide off the rails--and how the flexing must have tilted the slide and released the slide rear first, thus propelling the slide past my forehead....given the size of the dent in the radiator cover, that was a sobering thought.
I called Glock and told them of this--they did NOT want an accident report. Winchester did want to see the slide and barrel--which they dismantled and returned with the standard kind of CYA letter for their purposes.
It was not an squid load and then a second shot (no bulging at all), and I 'know' that was it not a double-charged case, FWIW.
So I kissed off the experience and stayed with the SA Omega for 10mm. As some time passed, I found I simply could not shoot Glocks anymore, so I sold the 17L and the 19s I also owned.
Funny, I now prefer .45ACP for my handgun reloading....