Book excerpt: Laughter in Interaction is an illuminating and lively account of how and why people laugh during conversation. Bringing together twenty-five years of research on the sequential organisation of laughter in everyday talk, Glenn analyses recordings and transcripts to show the finely detailed co-ordination of human laughter. He demonstrates that its production and placement, relative to talk and other activities, reveal much about its emergent meaning and accomplishments. The book shows how the participants in a conversation move from a single laugh to laughing together, how the matter of 'who laughs first' implicates orientation to social activities and how interactants work out whether laughs are more affiliative or hostile. The final chapter examines the contribution of laughter to sequences of conversational intimacy and play and to the invocation of gender. Engaging and original, the book shows how this seemingly insignificant part of human communication turns out to play a highly significant role in how people display, respond to and revise identities and relationships.