Sufficiently Unique Identifier

We met up for some drinks and dinner at the Milltown Tavern in Cabbagetown. Independent of the food and what not (Sue got a raw shrimp tail in her salad, and I got a fried shrimp tail in my fries), the funny highlight of the evening was the bill. In particular, when I opened the tab, the waitress apparently didn't bother to use the name on the credit card but instead punched an alternative, but sufficiently unique, identifier into the computer.

Welcome to the South. :-)