A rideshare with a giggly geek driver who may be a serial killer. The staggering-through-the-ink-black-woods-with-nothing-but-a-flashlight look and mood of “The Blair Witch Project.” A mystic schlock demon like Candyman, the Slender Man, or the spectral figures from “The Strangers.” A Victrola in the middle of the road, cranking an ancient warbly ditty à la “The…

