Is the experience of watching a film with others in a cinema crucially different from watching a film alone? Does laughing together amplify our enjoyment, and when watching a film in communal rapt attention, does this intensify the whole experience? Attending a film in a cinema implies being influenced by other people, an 'audience effect' that is particularly noticeable once affective responses like laughter, weeping, embarrassment, guilt, or anger play a role. In this innovative book, Julian Hanich explores the subjectively lived experience of watching films together, to discover a fuller understanding of cinema as an art form and a social institution that matters to millions of people worldwide. Combining recent scholarly interest in viewers' emotions and affects with insights from the blossoming debate about collective emotions in philosophy and social psychology, this study makes viewers more aware of their own experience in the cinema, and simultaneously opens up a new line of research for film studies.