Witches' Spell Double, double, toil and trouble; Fire burn, and cauldron bubble. Fillet of a fenny snake In the cauldron 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, Lizards leg and owlet's wing, For a charm of powerful trouble, Like a hell-broth, boil and bubble. Shakespeare, Macbeth