The Butter Battle Book is a children's book written by Dr. Seuss (Theodor Geisel) that talks about two groups of people, the Yooks and the Zooks who have a feud about how to prepare their bread. They lived on opposite sides of a wall called the "Border Wall." The Yooks believe that the butter should be on the top of their bread, and the Zooks believe that the butter should be on the bottom of their bread.
The story follows a Yook soldier who is trained to make and use a weapon called a "Tough-Tufted Prickly Snicker-Snack." His job is to protect the Yook's way of putting butter on their bread. The Zooks have their own weapon called the "Triple-Sling Jigger."
Both sides continue to make bigger and stronger weapons to defend their own way of buttering their bread. Eventually, the story ends with both sides threatening to use their weapons on each other, and neither side winning.
The book is a way to show children that fighting and violence are never the answer and that finding a way to compromise and work together is the best solution to disagreements.