A Tale of a Tub
Robert Hendrickson notes in his book "British Literary Anecdotes" that "Swift was always partial to his strikingly original "The Tale of a Tub" (1704). On reading the work again in later years, he exclaimed 'Good God! What a genius I had when I wrote that book!'"
1601 (Mark Twain)
[Date: 1601.] Conversation, as it was by the Social Fireside, in the Time of the Tudors. or simply 1601 is the title of a short risqué squib by Mark Twain, first published anonymously in 1880, and finally acknowledged by the author in 1906.