[ Of all things for Doc to make. A hover disco ball. It seemed practical in some ways. Probably (especially) if you were some kind of disco night club owner. ] I'm just messin' with you, Doc. There's some other stuff you've invented that's gotta be more embarrassing than this, right? [ That he has no doubt about.

He goes on a hunt for something like a hoverboard. Marty wouldn't mind riding one of those with the intent of enjoying himself, and not getting into some chase. ] Who wouldn't hire you, Doc? You're a genius!