Dr. Emmett Brown: You're late! Do you have no concept of time?
Marty McFly: Hey, come on. I had to change. Do you think I'm going back in that-that zoot suit? The old man really came through. It worked!
Dr. Emmett Brown: What?
Marty McFly: He laid out Biff in one punch. I didn't know he had it in him. He's never stood up to Biff in his life!
Dr. Emmett Brown: [looks at the restored picture, realizing the implications of what Marty just said] Ever?