Double, double toil and trouble;
Fire burn and cauldron bubble. For a charm of powerful trouble,
Like a hell-broth boil and bubble. By the pricking of my thumbs,
Something wicked this way comes.
Open, locks,
Whoever knocks! (Macbeth: IV.i 10–11; 18–19; 44–47) As a child I loved Macbeth. It was…