I bought this book at Barnes & Noble in Madison, WI used for $3.50. Leon puts himself into a variety of social situations and acts like a goofball. The results are mixed, but some stories are really funny. The chapter about faith is one of the best -- the author investigates Hare Krishna, Jews for Jesus, Transcendental Meditation, and Scientology as a potential convert. For the last, he takes on the persona of German musician Dieter Lietershvanz (which he uses elsewhere in the book as well) and stays at the Scientology hotel in Los Angeles.
This isn't a great book, but it has its moments. The Harmon Chronicles is from 2002, but nowadays the author is an active contributor to The Huffington Post.