I was glad I had a gun.
I have a CCW and carry, not because of any past events but because I'm protective of those around me. I kind of fall into Nutnfancy's "Civilian Sheepdog" philosophy.
A few friends and I went out to eat at a fast food place, and as we're eating we see some old angry homeless-looking guy dressed in traditional Muslim garb slowly cross the street, yelling his lungs out and gesticulating wildly the entire time. No one was with him. He came into the restaurant and got in line. Obviously very angry. Everyone is watching him, and one of my friends says "Is he going to blow us up or something?" One of my other friends points at me and says "Don't worry, he's armed." (He said this to our table, not to the whole place.) And the first friend looks me in the eye and says "I love you!"
Meanwhile, the crazy Muslim guy quit his angry shouting (only word I could understand was "America') long enough to order a burger and sit down. He quiets down a bit, then sits at a table by himself, and talks to himself, cursing America the entire time he was in there. We finished our food quickly and left.
My gun was thankfully not needed, but this is the first time we were glad one of us was armed. It was a strange event.