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From LiveScience.com

Why we love being scared

When you get scared, your heart rates soars, you breathe faster, your muscles tighten, and your attention focuses — all part of the fight or flight response. But when you know there is no real threat, the adrenaline rush can be enjoyable, scientists say.

One explanation for why we love scary movies is that we're not so much afraid as we are excited. Another is that we are willing to endure the terror in order to enjoy a euphoric sense of relief at the end.

A newer idea, put forth last year in the Journal of Consumer Research, suggests horror movie viewers are happy to be unhappy. People experience both negative and positive emotions simultaneously, the thinking goes. "The most pleasant moments of a particular event may also be the most fearful," wrote Eduardo Andrade of the University of California, Berkeley and Joel B. Cohen at the University of Florida.

The best

Alfred Hitchcock was, of course, the master at teasing all these senses. Konzett: "Even though we actually see only a small amount of blood (chocolate syrup going down the drain) and very little gore, if any, in this short two-minute scene, it has profoundly scared several generations of people, especially women, with many saying they are afraid to take showers for days. Very few horror scenes have had this kind of impact."

Even the low-budget "Texas Chainsaw Massacre," often criticized for gore and violence, "actually has much less blood than people imagine, with many of the killings occurring off camera," notes film reviewer and LiveScience columnist Benjamin Radford.

Steven Spielberg's 1975 "Jaws" left an entire generation afraid to enter the water for fear of shark attacks, Konzett notes. Yet Spielberg sidestepped outright gore for the most part, using thumping music, murky water and the constant threat of attack to terrify viewers.

"Films such as 'Psycho' and 'Jaws' capture the helplessness of people, catching them when they are most vulnerable. This is why many decades later, they are still popular among the younger generation in spite of contemporary horror films that are more sensational and filled with blood and gore," she says.