I just found a book called And The Hippos Were Boiled In Their Tanks, which was co-written by Jack Kerouac and William Burroughs in 1945, 10 years before either became very well known and was just published in 2008. Each author is a character in the book and they alternate chapters telling the story from their point of view. I just started it, so I don't know if I like it, but I thought the whole concept and the fact that it sat on a shelf for over sixty years is pretty amazing, considering the success the two men achieved years after it was written.