When I was 7 or so I used to love arcades with my focus being on games which got me tickets redeemable for candy. One day I noticed the counting of arcade tickets was done by weighing them on a scale so one day I ran my stack of tickets under the water fountain. Depending on how well I wrung them out I would get 2-3x the tickets. I am glad I found the world of computer security where I get to look for stuff like this all day.

I feel this was somewhere between outright cheating and possible cleverness, probably leaning more towards cheating.