Insanity in Macbeth Insanity to a certain person is someone's inability to make reasonable decisions and also the inability to separate the real from fake. In Shakespeare's MacBeth, the main character MacBeth goes through many incidents that make him seem insane. His insanity is evident throughout the whole play from his hallucinations to the ability to kill anyone he feels as a threat. One instance of insanity is his the meeting the witches. Witches are of the supernatural realm. Even to believe in the supernatural realm is to be a little insane. MacBeth talks to these creatures and also listens to them when he may know unconsciously that that these creatures are s