In reply to Christina Katsiadakis's post on Sun 17 Apr 2011 :
Try not to formally cue your subject to start the interview. I usually one-man crew my shoots. I like to set up my shot, then ask the subject what they had for breakfast to set my audio levels. I hit record and then segue into my interview questions without alerting my subject. I feel like subjects flip an internal switch that makes them very stiff if you cue them to the fact that recording has started. People are much more natural/conversational if they think they are having a conversation with you, and not the camera.