A low, dull, quick sound, such as a watch makes when enveloped in cotton

Well, the Poe toaster didn't show for the second year in a row (previously). Fear not, here's a lovely and disturbing animated short film of The Tell-Tale Heart from 1953, narrated by James Mason. Although nominated for an Academy Award, the UPA production was apparently the first cartoon to be rated X by the British Board of Film Censors.