It was probably the most ingenious bit of stunt casting ever, and a pretty bold move for the young show to have the King of Pop on as a guest star. Few knew at the time that Jackson had always been a fan, and longtime Simpsons producer James L. Brooks explained in a DVD commentary how he fielded a call in his office one day from Jackson himself, who proclaimed that he was a huge fan of Bart and wanted to write a No. 1 single for him , which is a little pretentious, but whatever. It's Michael Jackson. "Do the Bartman" is what he came up with.