The buttered cat paradox is a common joke based on the combination of two adages:
1. Cats always land on their feet.
2. Buttered toast always lands butter-side down.
The paradox arises when one considers what would happen if you attached a piece of buttered toast (butter-side up) to the back of a cat, then dropped the cat from a height.
Perpetual motion! ∞
The cat-toast entity would spin indefinitely, never quite landing.
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