"Crossing the streams" or "encountering your future self": Which is worse?

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I love movie quotes and I mix them into my playlist on my computer, so I just heard Doc Brown's quote about "encountering your future self" and it sounds pretty bad. It reminded me of the Ghostbuster's quote about "crossing the streams" though and I wondered which would be worse. Of course in the movies we get to see both and "encountering your future self" turns out to be no biggie, but which description of what COULD happen sounds worse? "All life as we know it stopping instantaneously and every molecule in your body reversing at the speed of light" or "chain reaction that would unravel the very fabric of the space/time continuim and destroy the entire universe"