If you're looking for a book that will make you think then you have to go pick up Predictably Irrational by Dan Ariely.
Essentially the book is about irrational behavior that we tend to repeat. There were many moments in the book that made me feel like a silly person. I laughed my way through most of the chapters. I highly recommend this easy read.
For a little taste of what this book has to offer check out Dan Ariely's blog.
