I work in a chain pharmacy that fills prescriptions for soft contact
lenses. (We don't fill them as such, we forward the scripts to an outfit
that fills them and sends them to us, and we dispense them.)

Yesterday, someone came in with a script for lenses, and asked, "Can I
have the prescription back when you're done with it?" No, we keep it on
file, but we can photocopy it for you. Why do you need it back? "Because
I only want to get one lens, I'll need it for when I get the other one."

Que?

I mean. What in hell is she going to do with one lens? Wear a half pair
of glasses for the other eye? A monocle maybe?

We've been puzzling over this for the rest of the evening, and we can't
figure out any plausible reason why she wanted to do this.

(If they were RGPs or some other permanent-type lenses, I could see her
losing one and wanting to replace only that one, but these are soft
lenses, you use them for however long they last and chuck 'em, so it
makes no sense to replace only one.)