Or how about this.
A young woman who doesn't yet realize she's a witch, is reading to a child while babysitting and stumbled upon an Urban Legends book. Unbeknownst to her, she somehow summons all the entities that reside in the pages, and they end up wreaking havoc on the small town she calls home. Slender Man, Bigfoot, Bloody Mary, Hook-Man, The Bunny Man, La Llorana, etc.
There could be endless possibilities.
