This Is A Bad Sign, Part 3

(The restaurant I work at has free soft-drink refills, with a drink machine in the lobby for customers. Basically, it’s free refills for people inside, but not drive-thru. I’m working the cash window at drive-thru when a teenager holding a plastic cup walks up, ignoring the rather large ‘No walk-ups’ sign next to my window.)

Customer: “Can you refill my [Drink]?”

Me: Um…no. You have to go inside to get your refill. We don’t have a machine in here.

(He promptly runs inside to get his refill. But not 20 minutes later, the customer drives up, holding his empty cup and a small paper sign from the lobby.)

Customer: “I’ll trade you the sign for a refill!”

(And apparently, he tried the same thing at the pickup window!)