 In this program - day two at The Human Zoo - the group is divided into two separate but distinctly unequal teams in order to study the concept of herd mentality. In a struggle to reconcile their conflicting loyalties, the subjects make some hard choices as yesterday s group bonding dissolves into adversarial team rivalry. Other researchers also examine clique mentality, bystander apathy, and diffusion of responsibility. As a counterpoint, the effects of positive herd behavior are illustrated by a Weight Watchers support group. Archival footage of Dr. Zimbardo s controversial 1971 Stanford University "prison" experiment is also included.