The Evolution of the Future Joke

Jeff Yang: The original joke was because in the future obviously Doc is always showing up Marty you must do this and in the cartoon it's all Marty you must lick my balls. And I think it's also a case of very often in comedy writing you don't know where the thing is going to lead you very often you find the funny thing. He says he learned how tightly structured sitcoms are by working on one that will probably never be produced but still ends up being very different. "I've done some writer's rooms but it's never been for a sitcom or I should say I've. written a couple of them"