Related:

• A radioactive cat has eighteen half-lives.
• Radioactive cats have 18 half-lives.
• 'Has eighteen letters' does.
• One of the most striking differences between a cat and a lie is that a cat has only nine lives.
  -- Mark Twai...
• It has been the providence of Nature to give this creature [the cat] nine lives instead of one.
  -- Pilpay (or Bidpai) -- The Greedy and Ambitious Cat, Chap. i, Fable iii...