I need help writing a synopsis and comment on Act IV, Scene 1 of Macbeth.  

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The three ugly hags secrete themselves in a dark cave and begin to dance around and chant as they make some sort of hideous witches brew. Hecate appears and praises the three hags for the mischief that they have set into motion, and it is at this point that one of Shakespeare’s most remembered quotes is spoken to announce the entrance of Macbeth, “By the pricking of my thumbs,/Something wicked this way comes.” Macbeth demands the witches explain their prophesies to him, and the do this through a succession of terrible apparitions. Feeling dissatisfied, Macbeth demands an explanation, but the ugly hags disappear. When Lennox comes, he tells Macbeth that Macduff has left his wife and children behind as he flees to England. Macbeth decides to murder Macduff’s family.

This is perhaps one of the most disturbing scenes based upon the dark, and eerie imagery and use of language. The scene is meant to be bizarre, and the use of the witches and their prophesies shows how truly evil Macbeth’s plans have become.