I’m reading Don Quixote for my world literature class and apparently when it was first published in 1605 it was world-changingly popular, one of the first “popular novels” as we know it today, and there were all sorts of people who were writing and publishing their own unofficial fan-sequels to Don Quixote which was basically the first fan-fiction, and then in 1615 the original author wrote an official sequel in which Don Quixote reads a piece of fanfic about him and sets out on a quest to beat up the author who mischaracterized him
This is one of the many reasons why Don Quixote is and always will be one of my hands down favorite books.