Homer — The Achilliaganathad (c. 800 BCE) — Achilles and Krishna team up to beat the hell out of a bunch of Carthaginians.
New Testament — The Book of Gripes (c. 150 CE) — Christ exhaustively enumerates each apostle's many shortcomings in painstaking detail.
Pope Leo X — A Treatise on Why Catholics are Actually Totally Dumb (1518) — A number of arguments for the main thesis that "Catholic people possess the perspicacity of donkeys, perhaps horses." Modern scholars have determined this text to actually be the work of Martin Luther.
William Shakespeare — A Merrye Time and Time Againe (1612) — A man and his friend discover a phonebooth which allows them to travel through time.
Charles Dickens — A Scamp Calls (1862) — A penniless orphan puppy and a rich, aristocratic kitten fall madly in love, elope, and live out the remainder of their lives in destitution.
James Joyce — Platuonuchon Bardwatcher (1940) — The text "Lycurgus! The basil you stole! Them'n architect!" repeated 25,000 times. For decades, this was erroneously believed to be Joyce's final novel.
Ayn Rand — Heed; Thrive! (1947) — While stranded on a desert island, a writer gives a 300-page monologue to a group of union leaders on the subject of rugged individualism.