Think that Dr. Seuss is an innocent author of kids' books? Think again. A number of his books have been banned, and The Butter Battle Book is one of his most controversial for its social commentary. (Source.)
When it was published in 1984, The Butter Battle Book was a major bestseller, right up there with Stephen King. (Source)
Check out Gulliver's Travels for another breakfast-food inspired war. Looks like the Yooks and Zooks aren't alone.