Dance Dance Ollie Revolution

High knees, up and down as fast as possible. This is the newest Ollie dancing craze, just like the video game Dance Dance Revolution. He'll stand in one place (usually on top of an air vent) and pick up his legs and put them down as fast as possible. If you prompt him by doing the action yourself, he'll usually repeat unless he is doing something really important like chasing down a kitty for "petting". I guess the rump shaker is next.