Ever felt that suffocating panic of being trapped in a tight dark space? Multiply that by 100—that’s *The Descent*, which turns 20 today. This claustrophobic horror preys on universal fears: darkness, being lost, hunted, even paranoia of untrusted friends. Six adventurers head for a tourist cave, but leader Juno secretly takes them to an uncharted system to be the first to map it. A cave-in traps them 2 miles underground, then they face sinister cave dwellers. What horror movie still haunts you alone in the dark? Drop it below!