Which reminds me of proposed design for a prepetual-motion device I once heard about: strapping a peice of toast, butter side up, to the back of a cat and flinging them into the air. In theory the cat/toast device should hover a few inches of the ground, spinning indefinitely with no loss of rotational velocity or gravitational potential.
Oringinal post: http://mbarrick.livejournal.com/274056.html