Question: What involves a couple's exploration of a strange town and their encounters with its denizens after their vacation is sidelined by a car accident that the sixteenth episode of the fourth season of the animated television series "South Park" was inspired by ?
Sentence (from "Chickenlover"): The episode was written by series co-creators Trey Parker and Matt Stone, along with David R. Goodman, and directed by Parker.
Relevant evidence: No