After being convinced by Lady MacBeth to kill Duncan, MacBeth goes to extra lengths to show innocence for the act he has not yet committed. When asked by Banquo, "who's there?" MacBeth answers "a friend" in which he means not a foe. He also lies to Banquo about thinking about the witches and their predictions. He says he has not thought of them when he has done so considerably. He is now acting the part of an innocent man that is really evil because he is planning on killing Duncan.