"I ain't afraid of no ghost."

Easy enough to say 40 years ago, when audiences delighted to the spectral pest control antics of Bill Murray, Harold Ramis, and Dan Aykroyd. You can't fear what isn't real, after all.

The show pioneered a tactic known as 'provocation.' This is when an investigator attempts to goad a spirit into manifesting by insulting it.

Things have changed. Since then, the proportion of Americans who believe in ghosts has surged 400% . Surveys indicate that nearly two-thirds of the population now hold supernatural beliefs, and 20% have reported seeing a ghost.

Entrepreneurial spirits

With roughly 50 million Americans purportedly having encountered a haunting, the business of ghost hunting has evolved into a profitable enterprise. It would appear that the invisible

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