This eclectic history of unusual crowd behavior describes a rich assortment of mass phenomena ranging from the amusing and quirky to the shocking and deplorable. What do fads, crazes, manias, urban legends, moral panics, riots, stampedes, and other mass expressions of emotion have in common? By creating a typology of such behavior, past and present, the authors show how common extraordinary group reactions to fear or excitement are. And they offer insights into how these sometimes dangerou...