Terry Pratchett: Eric

Another fantastic book (the ninth) of the Discworld saga. This time Rincewind, the most incompetent wizard in the universe is summoned and mistaken as a demon by Eric, a teenager demonology hacker. Eric "just" want to be granted three wishes: to be immortal, to rule the world and have the most beautiful woman in the world... The usual stuff. Travel with Rincewind, Eric, and many more, in time and history in this hilarious story. One of Terry's best!