Ruben & Lullaby is a digital comic/game that lets you shape the emotions of a quarreling couple with a touch.
From its website: “Tilt left and right to advance the story as it unfolds through the faces of the characters, without words. Rub the screen to calm someone down, or shake the phone to make them angry – an interactive jazz score responds to your every movement. You can try to keep them together, try to break them up, or just enjoy the music you can make out of their circumstances as they react to each other… and to you”.
The app is available on the iOS App Store for $0.99, http://opertoon.com/2009/05/ruben-lullaby/