[first lines]
Marty McFly: Doc! Doc! Doc!
Young Doc: [not paying attention] What?
Marty McFly: Doc!
Young Doc: What?
Marty McFly: Doc!
Young Doc: [finally seeing him] Aaaah!
Marty McFly: Okay, relax, Doc, it's me! It's me, It's Marty!
Young Doc: No, it can't be! I just sent you back to the future!
Marty McFly: Oh, I know you did send me back to the future. But I'm back, I'm back *from* the future.
Young Doc: Great Ssscott!