You've gotta get your father and mother to interact in some sort...
Dr. Emmett Brown: You've gotta get your father and mother to interact in some sort of social...
Marty McFly: Wh-what? You mean like a date?
Dr. Emmett Brown: Right.
Marty McFly: Well, what kind of date? I don't know. What do kids do in the '50s?
Dr. Emmett Brown: Well, they're your parents you must know them. What are their common interests? What do they like to do together?
Marty McFly: Nothing.