Scientists conducted an experiment with 5 monkeys in a cage with a ladder and bananas. Whenever a monkey climbed the ladder, the scientists sprayed the other monkeys with cold water. Over time, the monkeys began beating up any monkey that tried to climb the ladder to avoid being sprayed themselves. Even after substituting monkeys, the new monkeys learned not to climb the ladder through beatings by the others, despite none of them ever experiencing the cold water punishment. This showed how behaviors can be learned and spread within a group without full understanding of the original reasons.