Zen and the Art of Motorcycle Maintenance is a popular book an philosophy that virtually none of its readers understand. It is popular because the author was very much part of popular culture before he saw the problem with western philosophy, so he was able to write well to his audience. But this doesn't mean that his audience is capable of understanding the message, and based on the reviews I read on Amazon, none of the readers get it. The book is ultimately a critique of Plato's view of universal truth, and a discussion of some of it ill effects that Plato's view caused.
This book is related to my Plato's Curse post and is relevant to any discussion about religion or philosophy.