LADY MACBETH: My worthy lord,
Your noble friends do lack you.
MACBETH: I do forget.
Do not muse at me, my most worthy friends.
I have a strange infirmity, which is nothing
To those that know me. Come, love and health to all,
Then I’ll sit down. Give me some wine; fill full.
– William Shakespeare
Macbeth, Act 3, Scene 4. After the apparition of Banquo’s ghost causes a guilty Macbeth to throw a wobbly, the calm and calculating Lady Macbeth brings him back to reality. She reminds him that he has dinner guests to attend to. In true Jekyll and Hyde style, Macbeth suddenly reverts back to his role as genial host at the banquet. He explains that his strange outbursts earlier at the banquet are an illness he has.