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You have to tell them what is your favorite horror movie. Tough question. I may have to go with "The Shining" with Jack Nicholson. The scene when Danny is on his big wheel and sees the twin girls in the hallway is one of the most terrifying I've ever seen. But then again I was 13 when I saw "Halloween" and that movie changed me -- still don't like opening dark closets. And then there's "Jaws" -- I can't swim in deep water (even fresh water) without thinking about sharks somewhere in the back of my mind.
It's a very tough question.