(via) This is fascinating to me. In 1969 an industrial filmmaker named Homer Groenig made a short film of his son Matt telling a story to his two younger sisters, Lisa and Maggie. The film is called The Story, and it's now online at the Internet Archive.

(I'd embed, but can't figure out how to do so without having the thing autoplay, so you'll have to click through.)

The story itself is about what you'd expect a little boy's improvised story to his kid sisters to be, but what's fascinating is seeing the real-life models of the Simpson kids in living color.