We will never get a movie like The Blair Witch Project again. Having said that, we’ve had dozens of movies like The Blair Witch Project. In the 20 years since its release, it has transformed the horror landscape, and more besides. “Found footage” is now a sub-genre in itself thanks to it. How many horror movies have we seen claiming: “This all really happened, honest”? How many occult symbols and folk myths have crossed our screens? How many gung-ho teens have set off on an adventure, never to return? And how many times has a gimmicky horror reaped rewards for virtually no outlay? Blair Witch did not invent all these tricks but it put them together to create a phenomenon. It is the 21st century’s Exorcist.