Harpo Speaks! by Harpo Marx and Rowland Barber
Best autobiography/biography I've ever read: great life story, lots of funny stories, touching stuff too. I've been planning to read it again.
(BTW, my first Reddit comment!)
I'm not even a Marx Brothers fan, but I picked up <em>Harpo Speaks</em> about 20 years ago, on a lark, and loved it.
About 20 years ago I read Harpo Marx's autobiography, <em>Harpo Speaks!</em> Marx was a regular at the Algonquin for a while and a buddy of Alexander Woollcott. A good portion of the book covers the goings-on at that round table. It's also a very good book, in general.