Subway Celebrates

Yesterday, Subway offered a buy one get one free deal in the name of customer appreciation. The offer was promoted on the Subway Facebook page, but each individual store was able to choose whether to participate. The Rindge Subway did participate in this deal and was packed all day long. The deal was buy one six inch sub get one free with a purchase of a medium soda. 

There was literally people going in and out of the Subway all day long. This promotion was extremely successful in my town and in many other locations across the country as well. Why do you think that this promotion worked for Subway? Have you seen other offers such as this one?