Lady Macbeth is the one to blame for Macbeth’s downfall. When Macbeth first received the prophecy from the witches he was hesitant and didn’t want to follow through with the plan. Lady Macbeth convinces him to kill Duncan by telling him ”When you durst do it, then you were a man” (I. VII.). She is basically calling him a coward and a wimp if he doesn’t murder the king. Killing Duncan initially starts Macbeth’s bad luck and his short lived reign over Scotland. Lady Macbeth also lies to Macbeth saying “A little water clears us of this deed” (II. II.). Everyone knows that water will not wash away Duncan’s murder, and eventually Macbeth will be brought to justice after he is discovered. When Macbeth sees banquo’s ghost and goes crazy, Lady Macbeth tells the guests “Sit worthy friends. My lord is often thus, And hath been from his youth” (III. IV.). This proves that Lady Macbeth doesn’t want anyone to become suspicious of their crimes, and that she is the evil mastermind pulling this all together. She is using Macbeth to do the dirty work needed for her to be queen.
(I. VI.) Lady Macbeth uses dramatic irony when she told Duncan, "All our service In every point twice done, and then done double" after he arrives at their castle. What Duncan doesn't realize is that the Macbeth's aren't going to make this a nice and comfortable stay because they are really planning to murder him in his sleep.
(II. III.) The drunken Porter at Macbeth's castle displays comic relief when he said, "If a man were porter of hell gate, he should have old turning the key." He goes on and on making jokes every time Lennox and Macduff knock on the door until finally he lets them in. These jokes lighten the mood and makes the audience laugh a little bit after the previous scene where Macbeth kills Duncan.
(I. I.) The three witches speak of a paradox when they said, "Fair is foul, and foul is fair." This is said in the very beginning of the play when the witches are predicting what will happen when they meet Macbeth, and how he will eventually become the King of Scotland. This statement is just contradicting itself when they say that the opposites, fair and foul, are actually the same