While studies of written text continue to engage students from a number disciplines, investigations of naturally occurring talk have increased exponentially in the last decade. This paper reports on such an investigation, comprehensive discourse analysis of talk among professional peers (in a doctoral dissertation defense), attending to an instance of problematic communication and to some possible implications and interpretations of such nonsuccesses in social interaction. The method employed is an adaptation Labov and Fanshel. (Communicative nonsuccess, comprehensive discourse analysis, interaction among professional peers, naturally occurring talk, social structure, and language use.)