Out of Milliways:
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, suddenly there came a
tapping,
As of
some one gently
rapping, rapping at my
chamber door...
Spoilers for Warehouse 13 episode 1x12, "Nevermore."