I have not had anything serious, but have had a couple of close calls. One weekend, I was shooting when it started raining really heavily. I packed everything up and went home and then the next weekend went shooting again. I was finishing up shooting the box of .380 I had been shooting the weekend before and the first round fired fine, but the second felt odd. It only felt slightly different than the first, but different enough that I paused before pulling the trigger a third time. I'm glad I checked since the second round was a squib and that third round would have ruined a nice new Bersa .380CC and maybe me as well.
When I was a kid, me and my buddies took our .22s down to the woods for a bit of plinking. After shooting what little ammo we had, we headed home. On the way, a buddy sees a crotchety old neighbor about 75 yards away. That guy was always yelling about kids in his yard and this friend raises his rifle, points at the guy and pulls the trigger. We yelled at him and he lowered the rifle yelling that it was unloaded. He then demonstrates that it was unloaded by opening the bolt, only to have a dud .22lr fall out. That still gives me chills almost 40 years later.
When I was a kid, me and my buddies took our .22s down to the woods for a bit of plinking. After shooting what little ammo we had, we headed home. On the way, a buddy sees a crotchety old neighbor about 75 yards away. That guy was always yelling about kids in his yard and this friend raises his rifle, points at the guy and pulls the trigger. We yelled at him and he lowered the rifle yelling that it was unloaded. He then demonstrates that it was unloaded by opening the bolt, only to have a dud .22lr fall out. That still gives me chills almost 40 years later.