"The Coleridge story, upon which the idea entirely rests, and not on the charcteristics of people in Porlock generally(!), is of course that Coleridge "dreamt" Kubla Khan and on awakening started to write it down but was interrupted by the person on business from Porlock -- and later could remember no more of his 'dream poem'.

Douglas Adams' The Long Dark Teatime of the Soul begins at the annual Coleridge Dinner at Samuel T.'s [fictional] alma mater. Someone is reading "Kubla Khan" and as they get to the end, Adams lets us know we are in for a wild ride by ending the chapter "and then the reader began the longer and stranger second part of the poem."

To spoil the ending of the book, the protagonists end up saving the universe by travelling back in time and posing as the familiar (to us) porlockian visitor, thereby, interrupting Coleridge so he forgets the rest of the dream.