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Marty: You mean I'm going to see where I live? I'm going to see myself as an old man?
Doc: 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.
Marty: Doc, what do you mean?
Doc: I foresee two possibilities. One, coming face-to-face with herself 30 years older would put her in 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 worse-case scenario. The destruction might in fact be very localized, limited to merely our own galaxy.
Marty: Well, that's a relief.

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Doc: No, it can't be. I just sent you back to the future.
Marty: Yeah, oh I know. You did send me back to the future. But I'm back, I'm back from the future.
Doc: Great Scott!

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Old Biff: Flying DeLorean? I haven't seen one of those in...30 years.

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