They're coming!

Round about the cauldron go;

In the poisoned entrails throw.

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 blindworm's sting.

Lizard's leg and owlet's wing,

For a charm of powerful trouble,

Like a hell-broth boil and bubble
-Shakespeare