Incident On and Off a Mountain Road — Joe R. Lansdale

"Easing her back against a tree trunk, she sat and listened, watching for that strange face, fearing it might abruptly burst through the limbs and brush, grinning its horrible teeth, or worse, that he might come up behind her, reach around the tree trunk with his knife and finish her in a bloody instant."

“Incident On and Off a Mountain Road” is one of Joe Lansdale's most popular and terrifying short stories. Adapted for television, it appeared as an episode of Showtime's Masters of Horror series.