Chuck Jones: "Mrs. Doubtfire"(1993)

It's been a long-standing legend that there was more footage produced of "Pudgie Parakeet", the cartoon that causes Robin Williams' character in "Mrs. Doubtfire" to lose his job. The animation was done by Chuck Jones, and though it's not a complete "short" per se, there IS more to it than what got used. See for yourself!

Pudgie Parakeet
Uploaded by j-motion