What would happen on a class trip if the worst-behaved boy in the class accidentally traded places with the chimp at the zoo? As the class continues on their trip around town, the chimp's behavior as a "boy" becomes increasingly hilarious. The stern teacher doesn't realize the switch, but she gets fed up with the misbehavior and antics. Children will laugh aloud as the chimp wreaks havoc at a grocery store, a restaurant, and the fire station. Meanwhile, back at the zoo, the boy is having a very different day!