Me and my bro wanted to prank random people in our server with the Wardrobe and Marble Shrub wall at spawn, but one person decided to stay and and find a way to survive. I thought it would be amusing to give him the bare minimum he needed to survive, like fishing rods and a pond.
Then we decided to expand upon his cell. We made a system where me and my bro had creative mode on, and the people inside of the cell would have to pay us in fish in order to get stuff they wanted. If they wanted a bigger area to stretch their legs in, they would have to pay ever increasing amounts of fish to get stuff that they needed and/or wanted, like weapons to fight stuff or armor. Despite my brother thinking this was rather cruel, the players who stayed found the experience kind of enjoyable and amusing. They would frequently bicker amongst themselves, trying to ration their fish as food and use their fish for purchases. We were surprised when they stayed with us for longer than a day.
However, a player decided to try and burn everything, and I also crashed. We asked for feedback from the ones who stayed and played, and they thought it was amusing, but it needed some work. We put way too many ponds near them, and frogs then managed to mess them up. So, the idea needs some reworking and feedback, as well as some mods I suppose. Here are some pictures that we took of the players.