" In his classic work Extraordinary Popular Delusions and the Madness of Crowds, published in 1841, Scottish journalist Charles Mackay argued that people “go mad in herds, while they only recover their senses slowly, and one by one.”1 People in crowds often act in thoughtless ways—shouting profanities, destroying property, throwing bricks, threatening others. "

― Nicholas A. Christakis , Blueprint: The Evolutionary Origins of a Good Society