Sorry, Please Chai Again

(I am working in a new coffee shop on campus that is very busy at certain times of the day. We start to notice a professor pulling a scam on us at our peak times. Every day she waits until we are really busy. She waits with her friend in line but does not order anything. Then, after ‘waiting’ a while, she demands to know where her drink is. Several students are pulling this scam as well. We put up a sign that says you have to present your receipt, and make sure we tell everyone that orders. All the scams stop, except one.)

Professor: *slamming her hand over and over on the pickup counter* “Where is my chai?! Where is my chai?!”

Coworker: “Do you have your receipt?”

Professor: *indignant* “No.”

Coworker: “Then you don’t have a chai.”

(She never tried to pull the scam on us again!)