Mr. Strickland: “I noticed your band is on the roster for the dance auditions after school today. Why even bother, McFly? You don’t have a chance. You’re too much like your old man. No McFly ever amounted to anything in the history of Hill Valley!”Marty McFly: “Yeah, well, history is gonna change.” -Back To The Future

Source: The Physics of Back to the Future — Starts With A Bang! — Medium