Weird Books That Are Difficult to Explain but Totally Worth Reading

Has this ever happened to you, book-lovers? You're sitting there, minding your own business, reading a book. A well-meaning friend or loved one walks over and asks you what your book is about (although honestly they can't be that much of a loved one, because if they loved you they'd let you read in peace). You start trying to explain, but by the time you've told them that, "The structure is kind of a... non-linear, post modern thing?" or that, "The main character has a dog that's nonexistent, but ontologically valid," they're backing away slowly. Some books are just plain weird. So here are a few utterly, deeply weird books that are totally worth reading, anyway.