I recall a fan theory that the Rugrats cartoon was actually a figment of one of the character's imagination as their mind unraveled following off-screen traumatic events.

Basically the writer took it as a challenge to explain a children's cartoon show in the edgiest way possible

The theory goes that in the show Phineas and Ferb Candace is in a coma and her brothers building all that wacky shit is her coma dream. So the entire show is just her dream.

Fan death

All of the non Frank Herbert Dune novels. The Brian Herbert/Kevin J. Anderson novels are shit-tier fan-fiction and in myriad cases directly contradict what Frank wrote.