[Mackas]

All of Terry Pratchett's Discworld novels. These are in a league of their own in the lol department, even if you're not normally a fan of fantasy fiction. The other books in this thread are good but these will have you laughing until you're sore and the best thing is he just keeps writing them each just as funny as the last. And no, you don't have to read them all or in any order, dip in and out as you see fit. In fact I would skip the first few ones until you get a taste for them.

Don't let the Fantasy label put you off. They're as much of a parody of various other things as they are actual fantasy fiction - Phantom of the Opera, organised religion (not in a sacriligious way before all the happy clappies jump on me), Australia, Death, detective fiction, vampires, silent movies, politics, journalism, the opst office, and the list goes on.

I like them anyway.