Upsized
I used to work at Papa John’s to pay my way through college. There was a contest we had where if you got someone to “upsize” their pizza from like a medium to a large for an extra $2, you got points toward movie tickets. A large was simply $2 extra normally anyways.
Anyone that ordered a large, I simply put in a medium and “upsized” it. I won every week. My coworkers didn’t notice this obvious loophole and it didn’t cost the customer extra so I didn’t have a problem with this morally gray area. Free movie tickets every week was huge in college.