I almost called Christopher Moore the funniest writer you've never heard of, but his sales indicate that an awful lot of people have not only heard of him, but have bought his books. He's not perzackly a household name, but I'd put him in the company of Terry Pratchett, Douglas Adams, Neil Gaiman, and Carl Hiiassen—you know, writers whose books you save for when you
need a can't-fail pick-me-up.