Wow, my favorite book. That's a hard one but it has to be a book that made me giggle and go around writing H's in sunrays. I present you with "Areas of My Expertise" by John Hodgman.
This is one of my favorite books because its filled with TONS of fake information. Plus a list of names of 700 Hoboes. It's awesome and funny and a fun read. Plus John Hodgman is a genius for thinking this book up.