That a Glock frame would melt after five or six rounds.
That a .380 is a "cannon"
That a Browning BDA is based on the 1911.
That thousands and thousands of children in the US die each year as a result of gun accidents.
The best one:
I had a customer not long ago that brought his gun to the counter (checked, cleared, and trigger locked, of course) with a "problem." It was an old Hi Power. The problem was that when he pulled the "top thingy" back with an empty "clip" in the gun, the "top thingy went back and just stayed there." Similarly, at the range, when he fired off an entire magazine, the "top thing just got stuck back and wouldn't move."
So basically, the slide was locking back exactly as it was supposed to, and he thought that this meant it was broken. This did not occur to me immediately, because I would never have imagined that someone would consider this a problem. It's like someone saying, "When I put the gearshift on 'P' the damned thing won't move." It takes a moment to click that he's saying the car doesn't move when it's in park.
And of course, this guy's method for dropping the slide was to slam the rear onto a wooden table at the range. That made me wince.
So when I realized what he was telling me, I got five or six random guns out -- Sigs, Bersas, Rugers, whatever. I racked every slide and put them all on the counter so he could see that guns are meant to do that. He looked at all these guns with the actions open, and said, "Oh my God, they're all broken!!!"
:banghead: