Super Go Go Dance Riot!
Super Go Go Dance Riot!, or GDR as it's popularly known, is a wildly popular video game in which the object is to dance in time to pre-determined patterns on the screen. It started as a strictly arcade title, but is now available for every major home console, along with its special dance mat controller.
It's especially popular with parents seeking to get their couch potato children some exercise, and is singlehandedly responsible for getting millions of lazy gamers in shape.