spanish dummies

Today I was in my spanish class and the class was answering warm up questions. Everyone was saying the same thing, the right answer. Then as we go on this guy answers a question incorrectly but he screams it. I knew in my head that the answer was wrong but I found myself and the whole class repeating him! I suddenly remembered brain-dead megaphone. I was shocked. It is true that we will listen to the loudest person even if we aren't paying any attention to them. At first when I heard brain-dead megaphone I thought it was silly. I was thinking to myself this couldn't happen. Today I was proven wrong when my whole spanish class became spanish dummies. If this happened without anyone noticing they said the wrong answer due to the loud guy that no one was paying attention to, what could happen in our society when people don't notice what they are saying?