http://sleepisdeath.net/Sleep is Death is a game where two players make up a story as they go.
One player acts at the main character while the other player controls the world around him. They each take 30 second turns to move around, perform actions, and edit the scene. It's pretty much like roleplay with sprites. After the game the story is saved as flip book.
Example flip book explaining the game:
http://sleepisdeath.net/slideShow/