Damn
You sure you aren't just my mind operating during my downtime?
I always go into an interview like I would a sales presentation. I know more about what I am offering than my customer does, therefore I am in the driver's seat and let people talk when I want them to talk, and provide them with cues as to when that it is.
Then again, I guess that's my job though. If I can lead an employer through an interview, I can lead his customers through a presentation.