In Disney’s 1929 Silly Symphony “The Skeleton Dance”, we see several skeletons dancing around in a graveyard. This cartoon was quite popular, and was the first cartoon to use non-post-sync sound.
The cartoon was so well received that ten years later, Mickey Mouse was trapped in a haunted house, playing music for a group of dancing skeletons. This cartoon was “Haunted House”. It reused many bits from “The Skeleton Dance”, many of which were the exact same drawings, frame for frame.