Every ounce of the server's ability to deny and deadpan will be required.
In case you missed it, it's been confirmed that Dunkin' Donuts sucks.
Although, to be fair, a friend of a friend did say there was some sort of cash-related scam going around that involved exchanging and re-exchanging coins. It was on TV. I didn't see the episode nor do I remember the show. So take that for what it's worth.