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!'"
The Gilded Age: A Tale of Today
Charles Dudley Warner, a writer and editor, was a neighbor and good friend of Mark Twain in Hartford, Connecticut. According to Twain's biographer, Albert Bigelow Paine, their wives challenged Twain and Warner at dinner to write a better novel than what they were used to reading. Twain wrote the first eleven chapters, followed by twelve chapters written by Warner. Most of the remaining chapters were also written by only one of them, but the concluding chapters were attributed to joint authorship. The entire novel was completed between February and April 1873.