Sometimes, employees use their customers to find awesome loopholes too. This OP used to work at Papa John’s to make some extra money while he was in college. There was a contest among the employees, where every time they got someone to “upsize” their pizza, they’d earn points towards movie tickets.
Instead of asking customers to upsize their orders, the OP came up with a genius plan instead. Anytime someone ordered a large, he would simply put in a medium and “upsize” it. Needless to say, he won the free movie tickets every week and his coworkers never found out his secret.