The Austere Academy by Lemony Snicket
The Austere Academy is book Five in A Series of Unfortunate Events. And it has to be my favorite so far (I've only just finished book Seven-The Vile Village).
With pinching crabs, Vice Principle/Violinist Nero, the best (and worst) gym coach in the world, and two very kind triplets, you don't want to miss this crucial book in the series.
Or perhaps....you do (who wants to read about miserable orphans anyway?).