I recall an acquaintance in Idaho who had his rifle in the rack in his pickup. He saw an elk, jumped out to shoot it. He pulled the rifle towards him and since he had it capped, managed to have a discharge, blowing off his arm above the elbow. I'm sure Panhandle old timers will remember Monte.
I witnessed one case of a rifle fired at something in a lake, and the ball ricocheting off the water and hitting a kid in the ribs. He lived.
Another case, where the guy should have known better, was one of the local deputy sheriff's was shooting with us. He wanted to try one of the HK G3's we were shooting. We warned him to not shoot the steel targets on the range since we had full metal jacket ammunition. So of course he did. Bullet came back, and buried it's self about a quarter inch into his belly. Being old cowboys, we got out a pocket knife and removed the bullet, and told him to not do that again.
I've seen several barrels bulged from short starting over the years. I've seen at least a half dozen nipples blown out from those who think it's a good idea to remove them every time they clean the gun. I've witnessed four incidents of people breaking ramrods and running the splintered end into or through the hand in "speed shoots". I consider speed shoots a real liability to a club, as it is a known danger, and by holding a speed event, encouraging the behavior.
At the Fawn Creek shoot years, a pilgrim showed up with C&B revolver. He went to put it in his shoulder holster and shot himself. You need to drive 8 miles just to get a cell signal, so it's not a good place to get hurt. Now revolvers are only allowed to be used as single shots.
My X had bought a new .38 special. She shot a stump outside the cabin, and the bullet came back and hit her boob. Interesting bruise.
Another friend had come to shoot, and was shooting hard ball from his 1911. Bullets were coming back and hitting the cabin. I had him stop that.
Last fall, I was leaving the cabin, and heard something hit the car. I stopped and looked, and there was a small dent in the rear door. I looked behind on the driveway, and located a .22 bullet. Fortunately who ever fired it was a long distance away. I'm still kind of *#)*^~ at the dent in my Lexus, but there was no way to know who may have fired the shot, or from where.
I've seen several more careless discharges over the years, and have been responsible for a couple myself. Thank god I never hurt anyone with my carelessness.