Comedy filmmaker Judd Apatow revealed that he had once written an episode of "The Simpsons" to Conan O’Brien, who used to be a writer on the show.
“After only five 'Simpsons' episodes aired, I sat down and tried to write one when I was in my early 20s," Apatow said. "And what it was about was they went to see a hypnotism show and at the hypnotism show, they made Homer think he was the same age at Bart. And then the hypnotist had a heart attack. So now Homer and Bart became best friends and they spent the rest of the show running away because Homer didn’t want responsibility and didn’t want to be brought back to his real age. So I basically copied that for every movie I’ve made since.”
According to Apatow, the producers of “The Simpsons” called him recently to say that his episode was finally going to be produced for next year’s run.