If you enjoy Mark Twain, you might want to take a look at his lesser works and short stories. Some of them are quite good. http://www.amazon.com/gp/product/1420931210/ref=as_li_ss_tl?...

I remember "The Notorious Jumping Frog of Calaveras County" and "The Million Pound Bank Note" in particular, though it's been a few years since I read them.