Haunted house so terrifying you must accept the possibility of death before entering

A haunted house is so twisted and terrifying visitors are forced to sign a 40-page waiver accepting the use of tasers, drowning and the possibility of death.

McKamey Manor in Summertown, Tennessee, has earned a reputation as the scariest haunted house in the US.

Along with a gruelling physical fitness test, a background check and a drug test, visitors must also provide a safe word and proof of medical insurance before entering the house.

No one has yet made it through the 10-hour ordeal despite owner Russ McKamey promising $20,000 to anyone who completes the catalogue of horrors.

In recent days screengrabs of the manor’s waiver and nondisclosure agreement have been circulated across Twitter, revealing the horrifying reality of what is in store for guests.

Visitors must be aged 21 or over – or 18-20 with parental approval – and agree they understand that once entering the manor ‘there is no quitting unless serious physical or psychological injury is present’.

The waiver form states being scared or having a panic attack does not count as serious injury and adds: ‘Injuries may occur during their tour . . . which may include, but not limited to, head, neck and back injuries, death, stroke, traumatic brain injury’.

Other possible injuries include heatstroke, drowning and loss of consciousness.

Elsewhere the agreement warns the tour may include Tasers, shock dog collars and choking, and states that visitors accept they may even have plastic bags wrapped around their face.

By signing the waiver guests agree they do not hold McKamey Manor responsible for any injuries or distress caused.

How much, you may wonder, would such a depraved experience cost to enjoy?

For payment Mr McKamey requires a bag of dog food to keep his five dogs happy.

Finally before embarking on the twisted tour guests need to watch a video of every contestant who has ever attempted the tours.

The video adds: ‘This movie will explain in great detail what the Manor actual is, and what it is not.

‘Forget the crazy stories, this film will tell the truth to everyone including all future guests. Those partaking in the tour must clearly understand what will happen to each and every one of them.’

Mr McKamey told Fox 2 he needed to film the contestants to protect himself as well as warn visitors.

‘You’d be surprised over the years how many people have claimed something happened to them inside,’ he explained.

‘And I need to go back and show whoever needs to see it the raw and unedited footage, saying ‘Here ya go, here’s the complete show.’

‘When I use the hypnosis I can put you in a kitty pool with a couple inches of water and tell you there’s a great white shark in there, and you’re gonna think there’s a shark in there.

‘And so, when you have that kind of power over people, and have them do and see things that you want them to see, then they can leave here thinking it really happened, and they’ll go to the authorities and say, “Oh, whatever,” and I have to come back and show the footage and say, “It didn’t go that way at all’.’

The house has unsurprisingly achieved quite the level of notoriety among horror lovers and has featured on Netflix’s Haunters: Art of the Scare and an episode of Dark Tourist.

And while anyone who completes the tour will receive $20,000 there is of course a catch – visitors are fined for any use of profanity.

Mr McKamey added: ‘More of an inside little joke — that the manor is the most extreme haunt in the world but there’s no cussing involved.’