The Color Of Magic, Terry Pratchett, Corgi.

If you have never read a Terry Pratchett novel, this is the perfect one to get you hooked on this Discworld saga. This book denounces that the world is supported on the back of a giant turtle, luggage moves on hundreds of little legs, dragons exist only if you believe in them, and we learn what awaits on the edge of the planet. It is extraordinarily funny.