From two delightful imaginations comes a comic masterpiece in which the Four Horsemen of the Apocalypse ride motorcycles, the hound of the devil chases sticks, and the end of the world is subject to Murphy's Law. "The Apocalypse has never been funnier."--Clive Barker.
Start with this one and then read the whole Discworld series. They are humorous books in the fantasy genre, but appeal to people who don't think they like "fantasy". If you don't want to start at the beginning, read "Witches Abroad", "Hogfather", "Soul Music", or..., never mind, just start at the beginning and read them all.