The greatest "do you work here" variation I've seen ever?
This one lady one day asks me "are you gonna be doing this" (as in, am I going to be checking her out).
No, I'm just standing here in work uniform at a register with a light on and I just grabbed a bunch of random groceries and set them on my belt so that I could admire them all day. I don't work here, sorry.
She wasn't like the first customer at a newly opened register or anything either. I dunno.