@inthehands This reminds me of something that happened in one of my classes. We had a statement of account, from which we received "money" as reward for certain things, and could spend on "prizes". It operated like a checkbook. The teacher signed off on each entry adding or removing money.
I gradually adjusted the shape of one of the digits from one to another over a month long period - critically over a page boundary. I think it was something like slowly turning a 1 into a 7. My handwriting always was terrible...
Eventually, I started spending this money I had granted myself out of nowhere. One of the other students asked "How did Ryan get all that money?", and the teacher said "they've been saving up for a long time". Lol. Rofl. Lamo.