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I expected this to be the usual irreverent toilet humour book which my boys (11 and 8) would enjoy as a bed time story book. I was wrong. The main problem is that this book is far TOO disgusting, and also weird and troubling. One character is eaten alive by giant maggots swimming in a lake of excrement. In another scene, our heroes launch themselves in the air by climbing onto a giant spot on a buttock, squeezing the spot, then riding the flying pus. One man is rearranged so that his face is on his bum and his bum is on his head, so he has to poo through his own mouth. These are just the "highlights" and there are many more. One character called "The Kisser" hypnotises the wild bums by kissing them until they fall in to a trance. That's just weird.
The other problem here is that the story makes absolutely NO sense. I can handle the idea that your bum can detach and run around by itself, but giant bums, swimming shark bums?? Where did they come from?? They didn't detach off anybody. And bums can fly by fart power, with enough force to carry a human, but humans can't fly when their real bums are attached - that's just bad physics. The story rambles endlessly, and just seems to peter out at the end. There are no "laugh out loud" moments to make this book worth reading.
Having to read this story to my children, I was constantly editing as I read, sometimes skipping whole paragraphs which were too disgusting or weird. I also had to constantly translate from American to English words, as the book was originally American, and they just changed "butt" to "bum" but left all the other American words unchanged.
My children and I decided to finish the book, but we were all relieved when it was over and we could move onto another book. I threw the book in the bin, as it is not even good enough to go the the charity shop.