Sometime back in the 90's, Matt Groening wanted to make a Simpsons-pinoff featuring the adult characters from the main show as teenagers. And since im on the topic, i might as well mention that among the other Simpsons spin-off projects that he have mentioned to at one point thinking about or attempting to get made are a full-lenght Fantasia parody with Simpsons characters and a live-action version of the Krusty the Clown show. And initially, what ended up as the episode where Bart and Lisa stay at a horrific summer camp was actually supposed to become a feature film. Oh and shortly before his death, Phil Hartman was interested in playing a live-action version of Troy Mcloure in a spin off how about the character (and many Simpsons writers have said that they would have loved to work on it with him).