Heavy breathing, heart racing, body tensing, pupils dilated. They are the symptoms of fear.

And Ben Armstrong is an expert.

What You Need To Know

Heavy breathing, heart racing, body tensing, pupils dilated — they are the symptoms of fear

At Atlanta's popular Netherworld Haunted House, the shock scare is the weapon of choice

Co-founder Ben Armstrong says the haunted house business is trying to trigger "that fight-or-flight response"

Lindsey Harvell-Bowman, a professor of psychology at James Madison University, said Halloween gives thrill seekers a chance to explore fear without the risk of harm.

He's in the business of terror, co-founding Atlanta's popular Netherworld Haunted House.

“Our actors know, when people are walking up, some people are … just having a good time,” Armstrong s

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