The effects of behavioural and cultural expectation cues on the perception of a dyadic encounter were studied, using realistic videotaped interactions as stimuli. Intimate and non-intimate non-verbal interactions and intimate and non-intimate episode definitions were combined in a 2 × 2 design and presented to subjects who rated both information sources separately (N = 20) as well as in congruent and incongruent combinations (N = 48). The contribution of each of these two cues to ratings of the combined episodes was analysed by Frijda's (1969) average relative shift technique, and a multivariate analysis of variance (MANOVA) procedure. Results indicated that behavioural cues dominate perceptions, but this dominance is reduced in incongruent cue combinations, suggesting a weighted averaging strategy. Perceptions of the relationship between the interactants were more resistant to behaviour cue dominance than perceptions of the interaction. An analysis of open-ended accounts by subjects substantiated these findings. The results suggest that cultural expectations of interaction episodes have a salient and non-obvious effect on social perception.