Hayate the Combat Butler 3 If there's a prize out there for the most over-the-top manga in the world, I might recommend this one. Nothing in Hayate is done by half measures. So, our main character Hayate doesn't just have bad parents, he has parents who steal money from him, then sell him to the mob...
I really enjoyed the book. Some of the humor was pretty good (though aimed directly at anime fans), but even if you're not an otaku, most of the humor is still something you can get.