Goosebumps terrified a generation of '90s kids, but the series was incredibly popular. Producers even decided R.L. Stine's original episodes should be made into cinematic features, and of course the 2015 original film and 2018 sequel resulted in a plethora of Goosebumps fan theories.
Some of the fan suspicions have merit, but others are rather bizarre. A few people, for example, believe Jack Black's character in the film isn't even real. Stine loves to scare and confuse people, though. So who knows - maybe these fan theories are more plausible than not.
In the book and TV episode, The Blob That Ate Everyone, a kid named Zach finds a haunted typewriter that makes everything he writes come true. One Goosebumps fan theory suggests that typewriter is the same one the fictional R.L. Stine (Jack Black) uses in the film.
The old-timey writing device also aleegedly typed the manuscript pages that fly out of R. L. Stine's suitcase in the original Goosebumps intro sequence.
Readers eventually realize R.L. Stine's character, Hannah Fairchild, in The Ghost Next Door book is really an apparition. She became a ghost after a tragic fire destroyed her entire family. A former Redditor doesn't buy that story, though. They argue:
[Hannah is R.L. Stine's] daughter, and she died. So he made a book to bring her back and live with him. Now he keeps people away so nobody will learn their secret.
In the first Goosebumps film, R.L. Stine lives like a bachelor. And Redditor /u/Harry_Pott.. believes the character is very lonely. The fan suggests Stine wanted a child and accordingly wrote Hannah's tragic backstory with the intention of bringing her to life.
In the 2015 Goosebumps film, Hannah and R.L. Stine run into the Funhouse and encuonter the Blob from the The Blob That Ate Everyone book. Though described as a creature with a face in the novel, the shapeless lump in the movie is decidely without a visage.
Consequently, theory claims the two characters actually confront Monster Blood - the thick, typically green slime that appears in several Goosebumps novels.