The chapter explores how groups of 11 and 12-year-old boys naturally establish hierarchies and leadership roles, leading to conflicts, rivalries, and group identities. It discusses experiments where boys form group loyalties, exhibit biases, and engage in competitive activities like cookouts, ultimately highlighting the importance of shared goals in reducing friction and promoting cooperation. Examples from movies and historical events illustrate how uniting groups towards a common objective can lead to bonding and harmony, contrasting with the tendencies of individuals to seek conflict and group affiliation even in the absence of significant problems.