McKamey Manor in Summertown, Tennessee is called "The World's Scariest Haunted House." You must be 21-years-old, complete a sports physical, pass a drug test, provide proof of medical insurance, be screened via phone, and sign a 40-page waiver. The experience takes up to ten hours. They are offering $20,000 to the person who can make it through the entire house. Nobody has ever done it.