NARRATOR: This planet has, or had, a problem which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movements of small green pieces of paper, which is odd because on the whole it wasn’t the small green pieces of paper that were unhappy.

Douglas Adams (1952-2001) English author, humorist, screenwriter

Hitchhiker’s Guide to the Galaxy, Phase 1, “Fit the 2nd” (BBC Radio) (1978-03-15)
    (Source)

Though in the second episode of the radio play, this material was moved in the book, The Hitchhiker's Guide to the Galaxy (1979), into an introduction. The text was left unchanged, except that the first line reads "This planet has -- or rather had -- a problem ...."