Double, double toil and trouble;Fire burn and caldron bubble.Fillet of a fenny snake,In the caldron boil and bake;Eye of newt and toe of frog,Wool of bat and tongue of dog,Adder's fork and blind-worm's sting,Lizard's leg and howlet's wing,For a charm of powerful trouble,Like a hell-broth boil and bubble.Double, double toil and trouble;Fire burn and caldron bubble.Cool it with a baboon's blood,Then the charm is firm and good.- Scene I, Macbeth by William Shakespeare