There truly is no bottom to the well of human depravity.

I wrote a quick and dirty set of rules for conkers in D&D once. The idea was pretty much this article; some kid had come by a magic +1 chestnut and was cheating their way through the city conkers leagues and somehow the party got roped in to a quest to end the kids reign of terror. Like all the other kids in the city scraped up five gp or something to hire adventurers. I'm not sure if we ever got around to actually playing it.