Addressees (pro)actively shape narration in spontaneous interaction (Bavelas et al., 2000), in giving brief responses like uh huh, oh, and wow, labelled backchannels. This analysis, involving a group of face-to-face dialogues and a narrative completion test, supports the hypothesis that storytellers offer discourse-novel events after addressee generic backchannels and expanded information on formerly proposed events after addressee context-sensitive specific backchannels.