In all seriousness, I have a friend who called me today about this. His girlfriend was approached by a guy who got in her face and threatened her, along with her boyfriend (my buddy).
My buddy barely knows him. Apparently, this was all due to some issue his girlfriend and this guys girlfriend has. Nothing to do with either men.
It really got me thinking though, what would you do? I'm sure a lot of "tough guys" would say, find him and confront him...but that seems the most immature approach. I think it's the obvious first reaction, but not a realistic/smart one....unless you are pathetic.
There doesn't seem to be an actual concern at this point. The guy supposedly is a blow hard loser. However, I think my buddy is concerned over looking like a puss to have his girlfriend threatened and not take action. Legit concern I would say...even as futile or immature that might seem. I think any guys would initially think of this.