When I worked in retail, our boss would have us send our friends across the street to our competitor's store to really screw with their employees. The theory was that this would make them less courteous to their real customers, which would send more of them our way. He always made a big deal about how courteous we were. This went on for over a year when one day we started noticing very similar "troll" customers appearing in our store and screwing with us. I'm sure you can guess what I'm going to say next: Hahaha! None of this story was true.