I've actually been in the situation twice. Once a volunteer made a remark about coming in and shoooting someone. I'm 99.9% sure she was joking, but the joke itself shows very poor judgement. She was asked not to return. In another case, it was a co-worker. He was spoken to. He has refrained from making similar remarks.

If I were you, I would report it.

But let me ask, what's your relationship like with your direct supervisor?

You don't want to be in a situation where any of them go on a shooting rampage and you never reported this in advance.

I would hope he would be addressed by a rational supervisor, about what is and isn't appropriate to say, and that he would not immediately get fired, unless he continued doing it. But, since he's a freeper, it's likely he's said/done other things in the past, and that this might put him over the edge and result in justified firing.

Your employer is fortunate to have good employees like you to pick up the slack.

We're at a school, and when the shootings happened at VirginiaTech, for the following week they discussed what type of ammo would do what damage to humans, animals, etc. I told their supervisor then that if I ever knew for a fact that they were swapping guns, sights, ammo, etc. in the parking lot, I would call the actual police, not not our security detail.

I did report this incident to their supervisor this afternoon. I suggested that if he doesn't know how to handle it, that he can go to his boss and request some training from HR.

Thanks for the feedback.

Not every manager is comfortable talking to people about sensitive personality issues. Good luck!