The Beverly Hillbillies Down Under
Wikisimpsons - The Simpsons Wiki
In the scene that was shown, a man told Granny he wanted to become a professional didgeridoo player, and started playing one. Granny angrily snatched it from him, snapped it in half, and said, "Now it's a didgeridon't!"
Dr. Hibbert's children watched the movie on the DVD player in the family minivan, while they were stuck in a traffic jam. Also stuck in the jam was Carl Carlson, who saw the movie playing, approached the minivan, and asked Dr. Hibbert to change to the baseball game.
 Behind the Laughter