I did this same expriement (Score 1)

I had never heard about it before. However, I didn't sign a name. I would write things like "Hitler was bad" and "Cigarettes give me cancer" and "I like donuts!" I did this about 50 times before someone said anything and then I told them it was fine and they let me walk out of the store. The second time, about a month later, the girl a 7-11 said "No" and asked me to leave. That ended that game.