1) Toast. Toast with butter. You drop a slice of toast and it's gonna land on the butter side down correct? Yes.
2) Cats. Cats that fall. When cats fall from tree branches, roofs, etc; They always land on their feet right? Yes, of course.
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3) To get this to work, you tape the slice of toast on the cat's back with the butter side facing upward. You then pick up the cat and simply drop it. The cat will land on it's feet, but the toast will land on the side with
butter. It won't work... so, the cat just spins sideways in mid-air. It will never land. The end.