"Ford: "Life," he said, "is like a grapefruit." Creature: "Er, how so?" Ford: "Well, it's sort of orangey-yellow and dimpled on the outside, wet and squidgy in the middle. It's got pips inside, too. Oh, and some people have half a one for breakfast.""
January 1, 1970
https://en.wikiquote.org/wiki/The_Hitchhiker's_Guide_to_the_Galaxy