"I foresee two possibilities. One, coming face to face with herself 30 years older would put her into shock and she'd simply pass out. Or two, the encounter could create a time paradox, the results 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."
- Dr Emmett Brown in Back to the Future II
One my favorite time travel rants from Doc in Back to the Future II. It seemed to summarize well his ADD approach to science and drastic, sometimes illogical and rash decisions. Very underrated character. He should have had his own science experiment show on tv. Doc would have stomped Bill Nye off the air.