The HACTRN (abridged..)
Once before a console dreary, while I programmed, weak and weary,
Over many a curious program which did TECO's buffer fill,
While I pondered, nearly sleeping, suddenly there came a feeping,
As of something gently beeping, beeping with my console's bell.
"'Tis my DDT," I muttered, "feeping on my console's bell: Once it feeped, and now is still."

-- The Great Quux (with apologies to Edgar Allan Poe)