It was, indeed, another customer. And the Girl Scouts only had one box of Thin Mints left, so I was forced to purchase two boxes of Samoas as well as the last box of Thin Mints. Furtively. Because, you know, if I snitch random deli, I'm clearly suspect at the cookie booth.
Crazy Deli Lady to girl scout: What you mean you don't have any thin mints left?!
Innocent Girl Scout: Well someone bought the last box, I'm sorry.
Crazy Deli Lady: WHO! WHO BOUGHT THE LAST BOX!!?!?!
IGS: That person over there
CDL: WHAT!!! YOU!!! FIRST YOU CUT IN LINE AND STEAL FOOD AND NOW YOU TAKE THE LAST OF THE COOKIES!!!!!!!!
Yeah...that'd end badly.