The Tell-Tale Heart is a 1953 American animated short film directed by Ted Parmelee and narrated by James Mason. The screenplay by Bill Scott and Fred Grable is based on the 1843 short story of the same title by Edgar Allan Poe. The film was the first cartoon to be rated X, indicating it was suitable only for adult audiences, by the British Board of Film Censors. It was nominated for the Academy Award for Best Animated Short Film but lost to Toot, Whistle, Plunk and Boom from Walt Disney Productions.

In 1994, animation historian Jerry Beck surveyed 1000 people working in the animation industry and published the results in The 50 Greatest Cartoons: As Selected by 1,000 Animation Professionals, in which The Tell-Tale Heart ranked #24. In 2001 the United States Library of Congress deemed the film “culturally significant” and selected it for preservation in the National Film Registry. The short is included as a bonus feature on the first DVD release of Hellboy.

Via Wikipedia