At LCA in Wellington — immediately after a trip to Japan where I saw sumo for the first time — a number of us created a game we called "monopedal sumo." Basically, the rules are those of sumo wrestling. Push your opponent either down or out of a ring before they do so to you. Unlike normal sumo, in our game you do so standing only one one leg. If your second leg touches the ground. That also counts as a loss.
It’s surprisingly entertaining. Try it!