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 "Merry Christmas, Charlie Manson!"): The 29th episode of the series overall, it originally aired on Comedy Central in the United States on December 9, 1998.
Relevant evidence: No