I suspect it's common for people to want to take a shot with a firearm that they've never fired before. I know that I'm guilty.
However, it's strange when you give them instructions and they don't listen.
I suppose the worst case that happened to me was I was at a range shooting my scoped Encore .454 pistol. I didn't bring any .454 loads with me that day, but I DID have some "Ruger Only" heavy loads with 300 grain cast boolits. A teen and his dad came up and watched me shoot a few, and then they asked about the pistol, and the teen asked if I'd let him shoot it. I agreed if his Dad approved, and Dad said ok.
I sat the kid down and let him look through the scope. He'd never seen a scoped handgun before. I told him to put the forearm on the rest and not to get too close to the scope, as they were different from rifle scopes. He said ok, sat down and I could see him inching towards the scope. I reminded him again that a pistol scope was designed for long eye relief, and he said ok, he was ready. I looked at his Dad and Dad nodded.
I loaded a cartridge for him, reminding him that there was substantial recoil and to hang on tightly.He cocked the hammer and the next thing I saw was him with his eye almost touching the back of the scope.
BOOM!!
He didn't drop the pistol, but handed it to me posthaste, while Dad was digging a handkerchief from his pocket to stem the blood flow.
I never saw them again.
It took a while to get the flesh, eyebrow hair and blood from the grooves and crannies of that scope.