Ratburger

"Meet Zoe. She's got a lot of things to be unhappy about:
Her stepmother Sheila is so lazy she asks Zoe to pick her nose for her.
The school bully Tina Trotts makes her life a misery - mainly by flobbing on her head.
And on top of it all, the dastardly Burt has terrible plans for her pet rat.

I can't tell you what those plans are, but there's a clue in the title of this book..."

David Walliams