Did not Finish: Zombie Butts from Uranus! by Andy Griffiths, 2003, 0439424704.
This was a major disappointment. How can you screw up a book with a great title like that? A fantastic concept too. From the book cover:
"Zack Freeman is on his way to becoming a first rate butt-fighter. He has gone head-to-butt with all kinds of stinky scoundrels and butts-gone-bad. But even our doody-full hero is a-gassed by these latest stench invaders. They're round, blue, and smelly. They're ruthless, cunning, and very cheeky. Their odor is unstoppable. Their mission is downright foul. And they won't rest until Earth is wiped away by their nasty fumes."
A major part of the disappointment is that this is part of a Butt trilogy. I was all geared to read three great books and was massively disappointed.