So, not customer service but yeah, around ten years ago at an antique bookstore in Marseille.
I was shopping with a friend, visiting that shop for the first time. We were looking for ancient stuff, books that smell like vanilla and attic. It was our thing at the time.
Anyway, there was the shop owner (I assume) and a single client in his 60s dressed a bit extravagantly, little golden glasses and all. Unfortunately I can't remember what prompted the line, but we exchanged just a little and when we asked something about him, he did this raise-eyebrows-little-smirk-slide-glasses-down suggestively and goes "don't you recognize me ?". I was taken aback and went uuuhh.... nooo...? and I think what mental image he had of himself got hurt a little that day. Or maybe not. But I did not ask who tf he was.
I surmise he might have been a semi famous author or something. Or maybe it didn't have anything to do with writing, but the context seemed to suggest this.