" It is impossible to say how first the idea entered my brain; but once conceived, it haunted me day and night. Object there was none. Passion there was none. I loved the old man. He had never wronged me. He had never given me insult. For his gold I had no desire. I think it was his eye! yes, it was this! He had the eye of a vulture –a pale blue eye, with a film over it. Whenever it fell upon me, my blood ran cold; and so by degrees – very gradually –I made up my mind to take the life of the old man, and thus rid myself of the eye forever. "

― Edgar Allan Poe , The Tell-Tale Heart and Other Writings