Tom Dukich's Wunderkat.

From the website:

In an unusual alliance, the makers of Wonder Bread and the Conservative Conservation Coalition (CCC) unveiled plans for a project the two groups claim will one day revolutionize energy production in the United States.

The novel approach is based on two common but previously unexploited natural laws. One is a well-known form of Murphy’s Law which states that when toast is dropped, it always lands buttered side down. The other law states that when a cat falls, it always lands on its feet. These two laws are set in opposition to each other by attaching a buttered piece of toast to a cat’s back, buttered side up. If the cat is then suspended in the air, the two laws cause the cat to perpetually rotate. By building a device to hold the cat and capture this rotating energy, enough force is harnessed to drive an electric generator.

Link (via Fastback)