We're dog people and don't get the whole, you know, "cat thing", but if you for some reason have one and want to entertain it, $19.95 will buy you a Bada-Beam Laser Cat Toy, a cone-shaped device that'll project a dot around the room for kitty to chase all day. Then you won't even have to pet it!
Bada-Beam [Solutions, via OhGizmo! ]