Some people interrupt simply because when the other person is talking, they think of something to say. Maybe a rebuttal or an idea that is related to the conversation. They have the urge to blurt it out as quickly as possible. The problem is in that moment, the listening stops, and the focus moves away from the speaker. The interrupter will focus instead on what he or she wants to say. Formulating and rehearsing, while waiting for a crack in the conversation. - See more at: http://www.quickanddirtytips.com/business-career