A free burger for a free burger
Companies will go to extremes to get as much information as possible from their customers. One mainstream technique is by having guests fill out questionnaires or surveys in exchange for a free product. Wendy’s decided to implement this strategy and offer a free burger for your time.

The loophole begins after realizing that the free burger comes with another questionnaire to fill where you can score another burger, free of charge. One customer got more than a dozen free burgers by filling out countless surveys. However, the higher-ups at Wendy’s soon realized their mistake and withdrew the promotion entirely.