Lee Hall, who wrote "Billy Elliot," has created a screenplay, and they've got directors in mind.
The movie wouldn't film for three or four years.
The big question: who would play John?
John jokes it would have to be someone who could "gain a lot of weight, and then lose weight, then gain a lot of weight again."
He says Robert Downey Junior would be great because he can sing, or Justin Timberlake, who played John in the video for "This Train Don't Stop There Anymore."
John says maybe Justin Bieber would be old enough by the time they're ready to film.
He says, "Well, I want somebody cute."
