The Chocolate War - Robert Cormier

I feel like this book was always around in the bookstores and public library when I was a kid, but apparently I never read it - maybe because it's really aimed at boys. Not to say that as an adult I didn't enjoy it as a fast-paced story that gave me flashbacks to unpleasant school experiences (although not as unpleasant as some of the events in the book, thankfully).