Sourcery (Discworld, #5; Rincewind, #3)

by Terry Pratchett

“I meant,” said Ipslore, bitterly, “what is there in this world that makes living worthwhile?” Death thought about it. CATS, he said eventually, CATS ARE NICE.

“About how deep is the sea here, would you say? Approximately?” he said. “About a dozen fathoms, I believe.” “Then I could probably swim about a dozen fathoms, whatever they are.”