Quark knight

"Actually, Miss Muffy, it's a surprisingly good read. I particularly liked it."
Bailey, "Muffy's Classy Classics Club"

The Quark Knight is a book written by Jeffrey R.R. Deegan. It was only shown in the episode "Muffy's Classy Classics Club."

Most of the plot and characters are unknown, but the Quark Knight is a scientist named Ned, and the story is about Ned turning into a subatomic particle. It's also known that at the end of the story, Ned gets sucked into a hole in the space time continuum, which means that the story never happened.