Tristram Shandy by Laurence Sterne

According to Wikipedia: It was published in nine volumes, the first two appearing in 1759, and seven others following over the next 10 years. It was not always held in high esteem by other writers (Samuel Johnson responded that, Nothing odd can last), but its bawdy humour was popular with London society, and it has come to be seen as one of the greatest comic novels in English, as well as a forerunner for many modern narrative devices.