As bleak and terrifying as horror movies can be, they're largely just another day at the office for the cast and crew members who work on them. It isn't until they've gone through the extensive post-production process that most scares are truly born.
But that doesn't mean all horror films are tightly run ships and made in the totally typical Hollywood way.
Sometimes things happen, plans change, or a filmmaker decides to go rogue and challenge what the bounds of horror movie production can even be.
And so we come to these 10 horror films, each of them great in their own right yet each constructed in an extremely strange and unconventional way.
Some were forced to fly by the seat of their pants due to Internet leaks, others decided to be as method as damn possible, and there's even one which was filmed in such a bold way it flirted with never being legally released.
In some cases these methods ultimately benefitted the final film, while in others it was clearly a supremely stressful experience for just about everybody involved.
People are too quick to say "they don't make 'em like this anymore," but in the case of these 10 horror movies, it's actually true...
10. It Was Constantly Rewritten During Shooting (Due To Leaks) - Scream 2
Looking back, it's basically a miracle that Scream 2 turned out as well as it did - an all-timer horror sequel that released less than a year after Wes Craven's original took the world by storm.
But given the popularity of the first Scream and the Internet becoming more widely adopted in the late 1990s, Scream 2 also had to deal with constant set leaks.
As shooting started, Kevin Williamson's script was leaked online in full, forcing him to make a risky pivot, substantially rewriting major portions of the story while filming was going on.
Because the killers and every significant plot beat was out in the open online, Williamson changed the identities of the killers and the fates of several characters, while near-totally reimagining the finale.
Due to the frantic schedule, Williamson wasn't always able to keep up with the speed of production, and so Craven had to write and effectively workshop some scenes on the day they were filmed.
Yet watching the final film, you'd basically never guess it was the result of an enormously strained, time-pressured creative process.