Ok:
Cloud Atlas Mafia (Book Version)
You play a mafia game. Halfway through, you open a quicktopic with a new mafia game, different flavor and setup. Everyone in the game gets new roles, based karmically an their roles from the previous game (as in bad people who did good things get reincarnated as good people, etc.) Halfway through that game, same thing, for six different games. The sixth game you play out completely. When it's over, you back up and resolve the game before it, and so on until you finally conclude game 1 in the original thread.
In the movie version, the moderator gives everyone all 6 roles from the beginning and then switches which game is currently being played every few minutes.