What Could Possibly Go Wrong?

Someone should create a juggling game for the iPhone. With Bluetoooth they could figure out their relative positions and adjust levels for optimum quadraphonic sound. And they've got accelerometers so they can adjust the play speed of your music depending on how fast you toss them. And they could rapidly update their displays to portions of a large image so that, when juggled fast enough, a static image would appear to the viewer.