Filmmaking is an exhausting and meticulous industry, requiring a ton of preparation, and although shooting can be time-consuming, the prep is significantly longer. Before a single thing is filmed, the powers-that-be will have spent months or years on casting, finding locations, setting up shots, writing the script, and then rewriting it a dozen times for good measure - all of which takes forever but is necessary to ensure every aspect goes off without a hitch. However, at times, the most pivotal characters, scenes, and lines are concocted on the spot.

While we've looked at this topic before for the wider film industry, now it's time to delve into the horror genre. Given how horror movies can require an agonising amount of organisation, it's pretty risky to switch things up at the eleventh hour. Still, sometimes those switch-ups totally pay off; a minor character might get beefed up mid-shoot to turn a nobody into a badass hero or an iconic villain; a glaring plot hole may inspire an emergency rewrite that benefits that overarching narrative; or a sequel-baiting ending could be cooked up on set, transforming a one-off story into a thriving franchise.

These decisions may not always pan out, but the following ten horror films definitely benefitted from their last-minute changes. 10. Pinhead Was Turned Into The Main Villain - Hellraiser It's hard to imagine Clive Barker's Hellraiser franchise without Pinhead at the front and centre.

Whether the story is set in the past, the under.