The closest one to me, which is still way too far away to actually join and use, is "famous" for inventing the idea of putting giant electric motors in kids car toys and then driving them around ridiculously fast until they break or hurt themselves. Bunch of people hanging out socially and mostly screwing around accomplishing nothing but having fun, sounds like "play". I suppose it depends a lot on which hacker space you hang out at, there probably are boring ones.
