It's not always the customers or the counter help, sometimes it's the owner. Went into a small LGS a couple weeks ago to look at a Glock 43. Guy has one and brings it out so I can see it. He gets out a Shield and a Sig P238 so I can look them over as well. When I pick up the Sig, he proudly announces, it's a 1911! I nodded affirmative and moved on out the door.
I had a number of customers over the year proudly proclaim their Remington was a Pre-64....
Well, it might have been a Rem 700 built by Remington in 1963!
