*snicker*
Alright. Not the first time, per se. But they saw me as a boy then.
I was doing a warranty replacement for a guy today, probably in his 30s. I was just looking at the products briefly to inspect them, and I guess I moved my hand so that I wouldn't brush his arm. "It's okay, you can touch me, I won't bite"

"Well, unless I take you to dinner."

"Or you could take me to dinner, then bite me. But only on my neck."

I probably blushed a lot, I know I smiled and laughed and avoided making much eye contact afterward. I hope he thought I was being shy and appreciating it because I was. I know it was just a stupid, trifling little thing guys do all the time.
But they haven't done it with me before!
I actually probably would have flirted back, but it would have been awkward at work. And I was afraid that he'd suddenly notice something and snap out of it and get angry.
But I've been happy all day. Thank you, random nameless dude who's probably x1.5 times my age and pervy, I appreciated it.