Organization- Marty Sensing Barrier

Marty closed and opened his eyes again several times, enjoying the brash contrast between darkness and the artificial lights of the Rambler’s dashboard. His friends were mere shadows in the barely lit cabin, and he knew that he’d look the same to them.

Halfway through the tunnel, when the faint glow of daylight started to show ahead of them, he suddenly sat up as the hairs on his forearms and neck stood on end. A shiver went though him, like a subtle electric shock, tingling his balls and tickling the insides of his nostrils. He immediately sniffed the joint, wondering if some alien substance had found its way in, and—
...

Then they were out the other end and heading across the mountainside, the steep drop still to their right, and the glaring sun cleared away any dregs of darkness.

What was that? Marty wanted to say. Weird magnetic field? Radiation from the rocks? Someone walking over my grave? But when he looked around at the others he saw smiling faces, and a growing excitement that they were getting closer to their destination. Curt and Jules were singing badly again, Holden was drinking, and Dana stared dreamily from the window.

So Marty took another pull on his joint instead, and he didn’t even look back.

- The Cabin in the Woods: The Official Movie Novelization, chapter 3