I just finished reading one of the weirdest books I've read in a long time. I seriously think NNNNN, by Carl Reiner, evolved out of writer's block. It reads like something that a foundering writer would come up with out of desperation, but it's pretty funny, too.
NNNNN breaks all the rules: Ridiculous coincidences, melodramatic plot devices, silly names, and bad dialogue makes this book a hoot to read. I wish I had had writer's block at the time I read this, as I imagine it would be a fun book to read when I'm having a hard time writing.