This year marks the 20th anniversary of Chris Columbus’ comedy Mrs. Doubtfire. In the opening of the film, Robin Williams plays a voice-over artist who is recording lines for a cartoon that has already been made. (Yes, that’s out of order for a standard cartoon production, but for entertainment’s sake, we’ll let it slide).

The cartoon was supervised by legendary Warner Bros. director Chuck Jones, and animated by a small team of A-list animators that included legends like Bill Littlejohn and Tom Ray, and younger animators like Eric Goldberg. Coincidentally, Goldberg was also animating to the voice of Robin Williams for another animated project around the same period—the Genie in Aladdin.

In the film, we see barely a minute’s worth of animation of the two main characters—Pudgy Parakeet and Grunge the Cat. But in reality, Chuck Jones and his crew animated five minutes of material. This was never publicly shown until it was included several years afterward as a bonus feature on the Mrs. Doubtfire DVD.