From my current WIP, an as-yet unnamed supernatural "thriller" (in other words, a weird-ass horror book I hope might have a tiny bit of commercial appeal):
Following her up the stairs, Kelsey paused to ask, “so what are you afraid of, Erin?”
“Oh, me? The only thing which scares me is knowing too much.”
You see, Erin is the girl who has everything: looks, brains, a perfect California tan. Unfortunately, she's also psychic. Puts "knowing too much" in perspective, doesn't it? One member of their little group has already vanished, but it wasn't a member of the cast--no, the house, or whatever might be in the house, decided to start with the crew. Goodbye, sound man. It seems he had heart trouble, too. So sad.
Why don't they just leave if things are getting a bit out of hand? Good question. I asked myself the same thing while watching Paranormal Activity.
But I have several answers.
This is where things turn really "sour".