(From Harry Potter & The Prisoner of Azkaban)

Double, double, toil and trouble 
Fire burn and cauldron bubble 
Double, double, toil and trouble 
Something wicked this way comes. 

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. 

Double, double, toil and trouble 
Fire burn and cauldron bubble 
Double, double, toil and trouble 
Something wicked this way comes. 

In the cauldron boil and bake, 
Fillet of a fenny snake, 
Scale of dragon, tooth of wolf, 
Witches' mummy, maw and gulf.

Double, double, toil and trouble 
Fire burn and cauldron bubble 

Double, double, toil and trouble 
Fire burn and cauldron bubble 
Double, double, toil and trouble 
Fire burn and cauldron bubble

Something wicked this way comes.