The document describes the "good cop/bad cop" negotiation tactic where two individuals work as a team, with one taking a rewarding approach and the other a punitive approach, to gain advantage over their counterpart. It is a well-known tactic in law enforcement that preys on people's tendency to like those who agree with them. While it can be effective if started by the "bad cop", the target's best options are to understand their alternatives, recognize the manipulation, and try to win the "good cop" over through managing their own strengths and weaknesses in the negotiation.