“Once upon a midnight dreary, while I pondered, weak and weary,
Over many a quaint and curious volume of forgotten lore –
While I nodded, nearly napping, suddendly there came a tapping,
As of some one gently rapping, rapping at my chamber door.
«’Tis some visiter,» I muttered, «tapping at my chamber door –

Only this and nothing more.»” (Edgar Allan Poe, “The Raven”,)