I've talked about it before, and I saw it explained in detail by none other than Larry David on last night's episode of Curb Your Enthusiasm on HBO. They have taken in a hurricane refugee family, and one of the family members had a job interview. Larry explained to him that the interview starts out and the interviewer is on top and you're on bottom as they start to grill you and ask all the questions. As you start to ask more questions you start to move up and interviewer starts to move down. Eventually you have flipped the interview, and the interviewer is answering all of the questions and trying to impress you. That's where you want to be at the end of the interview.
Check out the episode if you have it DVR'd, Tivo'd, or have access to HBO on-demand (Episode 56: The Rat Dog)
Larry suggests that Leon flip the power dynamic of an interview by asking questions, not just answering them. Leon gets excited by the idea of turning it around on him: "topsy turvey the motherf**ker!" - from HBO.com episode guide
