The Hitchhiker's Guide to the Galaxy

The first of a trilogy of 5 (yes a trilogy).
Get it, read it, then read it again, it wont do you wrong.

"Look, would it save you a lot of time if I just gave up and went mad now?"
The Hitchhiker's Guide to the Galaxy

"There is a theory which states that if ever anyone discovers exactly what
the universe is for and why it is here, it will instantly dissapear and be
replaced by something even more bizzare and inexplicable. There is another
theory which states that this has already happened."
The Restaurant at the End of the Universe