Try having 5 cats do it all at once (Sugarly, Pepperpot, Excalibur, Merlin & Striker)! They seem to go from the basement and race each other up 2 flights of stairs to bounce of a bedroom wall and/or bed and run back downstairs again! House cats spend most of the time sleeping. In the wild the often have to have burst of energy for survival. Must be a communing with the inner cat thing!:tounge2: