One of the things that is a pet peeve of mine, is parents showing up with no hearing protection for their kids. I just can't stand that.
I always keep some extra foam ones I steal from work, in my case.
At least it offers some protection for them.
I did have a idiot moment at the range once. I released the slide on my 1911 after a magazine change, and had a slam fire. Right over the head of my best friend, who was sitting on the bench.
He slowly looked up with a classic "Oliver Hardy" stare.
Oops. At least the barrel was pointed down range.