No, no, no, guys: the key to the difference between terror and horror is believability. Terror is what you feel when something real, and real-ly scary, is about to happen. Horror is what you feel when what has either happened, or is about to happen, is so awful that you want to deny that it could be/could have been real.

Interesting--I never really thought about these words being
tense-sensitive (well, I figure if a browser can be case-sensitive, then surely tense-sensitive must be a word).
You can't feel terror* once the event is finished--it is pretty well restricted to something that is in the present or the future. Horror can be felt at a past, present, or a future event.
*I don't mean that the residuals of terror of something that
almost happened to you abate immediately. I mean that if you come upon a scene where something terrifying has happened, but all danger is now gone, you cannot feel terror at that specific event.
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Terror can soil underwear. Horror can't.
that depends...

Good one, tsuwm!
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Alex--I am typing to Backstreet, from a video website!
Love 'em, love 'em, love 'em! Even went to your town to
hear 'em, November 17th, 1999. "I Want It That Way"...
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you walk off
the stage, having just bombed the whole speech, and you realize that your fly is unzipped."
I wish I had said that.

Well, c'mere, Bill, let me help you with that zipper..