There was one on the OldGuild that I was in very briefely where the GM was a high school kid that had multiple personalities, played by other rpers, in his head that would battle in order to gain the kid's attention to make everyday decisions. Like, if the kid opened his closet to find something to wear, the other players would shout out things they thought would be good to wear while simultaneously doing odd things in order to make their ideas the most resound thought in the kid's head. It had potential to be great, but it never went far.