"I think I saw another ship in the sky today," he said at last. "A big white one. I've never seen a big white one, just the six black ones. And the six green ones. And the others who say they come from so far away. Never a big white one. Perhaps six small black ones can look like one big white one at certain times. Perhaps I would like a glass of whiskly. Yes, that seems more likely."

The Ruler of the Universe
"The Restaurant at the End of the Universe"