The climax of Shakespeare's play "Macbeth" occurs in Act 3, Scene 4, during the royal banquet hosted by Macbeth. At this moment, Banquo's ghost appears, which is a manifestation of Macbeth's guilt and paranoia. The appearance of Banquo's ghost not only disrupts the banquet but also marks the peak of Macbeth's descent into madness and tyranny. This event intensifies Macbeth's inner turmoil and serves as a turning point in the story, leading to further acts of desperation and violence as Macbeth's grip on power becomes increasingly precarious.