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 owlet'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.

~ William Shakespeare (Macbeth)