LAS VEGAS (AP) — JT Mollner likes to compare haunted house visitors to bungee jumpers and skydivers — they want to be safe, but they also want an adrenaline rush.

Mollner is a managing partner at Freakling Bros in Las Vegas. His dad started scaring people in their front yard in 1976, and the family developed the freestanding haunted house in the 1990s.

When the family realized that horror movies were getting scarier but haunted houses remained at the same thrill level, they decided to up the ante and create an R-rated attraction called Gates of Hell.

Some scream or cry, and some of the cockiest visitors leave sobered.

That's if they make it out. Mollner says visitors in about one-fifth of groups are so terrified that they have to leave the house early.

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