Conversation-analytic (CA) research projects have begun to involve the collection of interaction data in laboratory settings, as opposed to field settings, not for the purpose of experimentation, but in order to systematically analyze interactional phenomena that are elusive, not in the sense of being rare (i.e., ‘seldom occurring’), but in the sense of not being reliably or validly detected by analysts in the field using relatively standard recording equipment. This chapter (1) describes two, CA, methodological mandates – ‘maintaining mundane realism’ and ‘capturing the entirety of settings’ features’ – and their tensions; (2) provides four examples of elusive phenomena that expose these tensions, including gaze orientation, blinking, phonetic features during overlapping talk, and inhaling; and (3) discusses analytic ramifications of elusive phenomena, and provides a resultant series of data collection recommendations for both field and lab settings.