10 Ways Horror Movies Got Scarier By Accident

10. A Visible Crew Member Was Kept In The Film - The Descent

Neil Marshall's brilliantly white-knuckle low-budget horror film The Descent follows a group of six women who, upon entering a cave system, find themselves preyed upon by the "crawlers" residing within.

It's an exceptionally atmospheric and unsettling movie in its own right, albeit one elevated even further by an on-set mistake which sneaked its way into the final cut.

Shortly after release, some fans reported that they could see a crawler sneaking around the caves early in the movie before they're actually introduced.

When The Descent hit DVD, the rumours were indeed confirmed, as roughly 25 minutes into the movie when the women light a flare, to the left of the frame a spectral face is briefly visible peeking from behind a rock.

On the DVD commentary, Marshall confirmed that this was in fact a total accident: rather than a crawler deliberately inserted into the scene as an Easter egg, it was a crew member who inadvertently got himself caught on camera.

The visual is thankfully just faint enough that audiences have the opportunity to see it but not quite realise exactly what they're seeing.

Within the context of the movie itself, it basically introduces the crawlers before they're officially set upon the movie's characters - accidentally, of course.