Quotes from the Movie Back to the Future Part II

The time-traveling is just too dangerous. Better that I devote myself to study the other great mystery of the universe: women!

Doc Brown

Marty! What in the name of Sir Isaac H. Newton happened here?

Doc Brown

The skyway's jammed. It'll take us forever to get there. And this [referring to Gray's Sports Almanac] stays here. I didn't invent the time machine to win at gambling, I invented the time machine to travel through time!

Doc Brown

They're taking her home, to your future home! We'll arrive shortly thereafter, get her out of there and go back to 1985.

Doc Brown

You mean, I'm going to see where I live? I'm gonna see myself as an old man?

Marty

No, no, no Marty, that could result in a... [gasps] Great Scott! Jennifer could conceivably encounter her future self! The consequences of that could be disastrous!

Doc Brown

I foresee two possibilities. One: coming face to face with herself thirty years older would put her into shock and she'd simply pass out. Or two: the encounter could create a time paradox, the result of which could cause a chain reaction that would unravel the very fabric of the space-time continuum and destroy the entire universe! Granted, that's a worst-case scenario. The destruction might in fact be very localized, limited to merely our own galaxy.

Doc Brown

No! No, I'm not feeling all right! I don't understand one damn thing that's going on around here, and why no one can give me a simple straight answer!

Marty

Oh, they must have hit you over the head hard this time.

Lorraine

Mom, I just want to know one thing. Where's my father? Where's George McFly?

Marty

Marty... George, your father, is in the same place he's been for the past 12 years. Oak Park Cemetery.

Lorraine

So we go back to the future, and we stop Biff from stealing the time machine.

Marty

We can't, because if we travel into the future from this point in time, it will be the future of this reality, [indicates in chalk the alternate reality, 1985A] in which Biff is corrupt, powerful, and married to your mother, and in which this has happened to me! [holds up newspaper reading "EMMETT BROWN COMMITTED"] No, our only chance to repair the present is in the past, at the point where the time line skewed into this tangent. In order to put the universe back as we remember it and get back to our reality, we have to find out the exact date and specific circumstances of how, when, and where young Biff got his hands on that sports almanac.

Doc Brown

It was nice talking to you. Maybe again we'll bump into each other sometime in the future.

1955 Doc Brown

For all I know you did send me back to the future, but I'm back, I'm back from the future.

Marty