"Conversations are like dances. Two people effortlessly move in step with one another, usually anticipating the other person's next move. If one of the dancers moves in an unexpected direction, the other typically adapts and builds on the new approach. As with dancing, it is often difficult to tell who is leading and who is following in that the two people are constantly affecting each other. And once the dance begins, it is almost impossible for one person to singly dictate the couple's movement."