If you haven't read The Chronicles of Amber (sometimes The Amber Chronicles, my copy says 'The Complete Amber Chronicles' on it but that's because it's 10 books in one) by Roger Zelazny...go read it now. It's a 10 book series which comprises of two 5-book series and it's the most amazing thing I've ever read. Addictive, funny, fantasy, amazing character development, very surprising, everything anyone could ever ask for in a fantasy series. Or a book in general.
They're extremely hard to find, however, and though I'm under the impression that they just reprinted them, before that they had been out of print for a long time. I don't even see the reprint very often--I think whoever told me this was wrong.
Aside from that, I'll agree with Gringoire that you should read The Princess Bride. It's very funny, and if you've seen the movie (and liked it), you'll like the book.
