Subway

Subway used to give out little «Subway Club» cards. Each time you bought a sub, you got a little stamp. Fill up the card, you got a free sub. You can’t drive a mile in any direction without bumping into a Subway, and the food is fairly healthy, so I used to eat there a lot. Maybe once a week.
One day, with a card full of stamps, I headed up to this Subway on my lunch break. Salivating over the thought of a delicious turkey sub, I got through the line and presented my card.
Manager-​looking guy, running the register: «Uh, we can’t take this.»
Me: «Why not? It’s filled with the requisite number of stamps.»
Manager: «Yeah, but they are from different Subways.»
Me: «…»
Manager: «We don’t want to give away free sandwiches if you didn’t buy your sandwiches here. We have a different colored stamp than all the other restaurants so we can tell.»
I was caught. My evil plan, to travel around the world collecting stamps from various Subway locations in order to scam this particular Subway out of one measly sandwich, was foiled. I had spent days crossing the United States on foot, lost a small fortune flying from continent to continent, and had lost three toes to frostbite in the frozen tundra. All so that I could be sure I would not spend any money in this particular store, so that my free sandwich would be, in fact, stolen goods.
Now I know how Doctor Doom feels when he’s defeated by the Fantastic Four. Like that one issue when Doctor Doom is hungry and Mr. Fantastic is being a jerk for no reason.