A man sat alone reading a book, trying to forget his lost love Lenore, when he heard a tap, tap, tapping at the door.
At first he ignored it, but as the tapping grew louder he rose from his chair. He answered the door, but no one was there.
Returning to his chamber, he heard a tapping once more. He opened the window admitting a raven, who perched on his fireplace next to the portrait of Lenore.
He asked the bird questions about Lenore, but it only ever answered, "Nevermore."
The man grew angry and shouted, "Prophet! Thing of evil! Prophet still, if bird or devil!" "Tell this soul with sorrow laden if, within the distant Aidenn, it shall clasp a sainted maiden whom the angels name Lenore!" (Poe)
The raven haunted and tormented the man, driving him insane forevermore.