Mark Twains' Adventures of Huckleberry Finn opens with two warnings. In the first, Twain tries to head off any attempts to find a motive, moral, or plot in the book. In the second, he explains that the book uses a number of dialects that he's painstakingly researched. "I make this explanation for the reason that without it many readers would suppose that all these characters were trying to talk alike and not succeeding," he writes.
