I just began playing a fascinating game called Nomic. The game is played by email and starts out with a very simple set of rules (e.g. something like "each turn each player rolls a dice and gets as many points as are shown on the dics"). Each player may propose a new rule each turn. The game quickly gets complicated and quite, well, weird. Apparently this game has been around since the Arpanet. I'm playing a variation of the game called Nomopoly. Quite neat.