The Hitchhiker's Guide to the Galaxy/Mostly Harmless/Trivia
- Author Existence Failure: The books were technically completed, but Adams reportedly regretted the dark ending of the last book and wanted to write another. His death prevented that.
- Creator Breakdown: Regarding the Downer Ending of Mostly Harmless and the mixed reaction from fans, Adams conceded, "I just had a thoroughly miserable year, and I was trying to write a book against that background." He intended a sixth book to give the series a better conclusion, but succumbed to Author Existence Failure first.