Okay, I don't remember the source, and I don't remember all the details (I saw it on a "news magazine" about 10 years ago)...
So, take it with a grain of salt.
Apparently there was some guy who heard something go bump in the night.
He gets up, gets his gun, and goes to investigate (his first mistake: in most cases it's best to stay in your bedroom and call 911).
Goes downstairs, calls out "who's there" (second mistake: he gave up his location), and hears a noise from the front closet.
So, he goes to the closet, swings open the door and fires blindly into it. (third mistake, he fired at an unknown target)
Well, seems that his daughter or son had snuck out for some quality teen time with a "friend" and was sneaking back in.
The son/daughter died.
This guy said he'd never touch another gun again.
Like I said, I don't have any source on this, if anyone has more info I'd like to hear it.
-Kframe