Answer:
The appearance of Banquo's ghost at Macbeth's coronation dinner
Explanation:
The appearance of Banquo's ghost at Macbeth's coronation dinner serves as a vital event in the play. This event occurs in Act Three, Scene 4 when Banquo paranormally resurrects and is seen by Macbeth. An important factor to this scene is that, based on the dialogue, nobody can see Banquo's spirit but Macbeth. When he tries to express his experience to Lady Macbeth, she replies with “Fie, for shame!” Macbeth goes on to say “when the brains were out, the man would die, And there an end; but now they rise again... And push us from our stools.” This conveys that his interaction with Banquo's ghost is a manifestation of Macbeth's loss of sanity and abundance of guilt. He becomes mentally unfit from the actions of paranoia, and at this point in the plot begins to suffer from his megalomaniac ways. If this event were altered, it's possible Macbeth's demise would not have been met so soon, if at all.