Humans are homo duplex, seeking to be individuals but knowing this is only possible in communities. Thus, humans struggle to integrate these two sides of their nature. Megachurches have been enormously successful at resolving this struggle. How do they do it, and what is it about their structure and rituals that makes so many feel as if they are high on God? The affective energies and emotional valences that characterize religious ecstasy are the primary focus of our study of megachurches. Empirically, humans want and desire forms of what Randall Collins calls “emotional energy.” Drawing on extensive qualitative and quantitative data on twelve nationally representative megachurches, we identify six desires that megachurches evoke and meet: acceptance, awe and spiritual stimulation, reliable leadership, deliverance, purpose, and solidarity in a community of like-minded others. Megachurches satisfy these desires through co-presence—being in the presence of other desiring people—a shared mood achieved through powerful musical worship services, a mutual focus of attention on the charismatic senior pastor who acts as an emotional charging agent, transformative altar calls, service opportunities, and small-group participation. This interaction ritual chain solidifies attendees’ commitment and group loyalty, and keeps them coming back to be recharged. Megachurches also have a dark side: they are known for their highly publicized scandals often involving malfeasance of the senior pastor. After examining the positive and negative sides to megachurches, we conclude that they successfully meet the desire of humans to flourish as individuals and to do so in a group.