The Descent (film)/Nightmare Fuel


 * The very first time a Crawler is seen up close. Perhaps the most terrifying Jump Scare in the entire film.
 * The scene where Sarah gets stuck in that horribly, horribly tight tunnel. Also, the shots of the girls (primarily Holly) crawling through it will make even those with mild claustrophobia feel very uncomfortable.
 * Sarah's hallucination in the car. Dear god.
 * The scene where the crawler is right beside Sam and Becca as they're hiding, and it's making that horrible sound...