I drew my sidearm once way back in the mid 80s, and in hindsight realized it was probably inappropriate.
I had just gotten to Charleston SC and was flying C-141s out of CAFB. My wife hadn't arrived yet so I went to one of the malls one Saturday afternoon just to kill some time. After about a half hour I noticed this short disheveled guy in my periphery- never in my line of sight but always just left or right. If I looked at him he'd avoid me. Suddenly he started walking up to me and whispering something as he passed, but I couldn't hear what he said. This happened three times- he'd come out of my periphery, say something I couldn't hear, and then slink away.
Well, three strikes and I was out of there. I waited until he was walking away and abruptly changed directions and made for the exit. As I got into my car I spotted him slinking up between the cars straight towards me. BTW, it was a convertible Triumph with the top down (what was I thinking?) I reached under the seat and pulled out my AMT Longslide Hardballer just as he got to the drivers door.
You'll have to fill in the blanks now. This time, audibly, he said, "I got a big ____, you want to ____ it?" The Hardballer was already coming up to the window and it was too late to stop it, so as it leveled to an aimpoint between his eyes (and I'll never know from where it came) I said, "Yeah? So do I!"
The look on his face was priceless. That giant hole at the end of the polished stainless steel (long)slide had his total attention, and he almost tripped himself running away. I never called the cops because there wasn't really a threat (to my safety or heterosexuality) and carrying under the seat was illegal; loaded in the glove box was legal, but the AMT didn't fit.
It's not a story I tell often for the one obvious reason, but also because as I said, drawing a firearm in such a situation was inappropriate. In my defense, I was sure it was a druggie about to rob me right up until he said what he said, and by then the wheels were already in motion.