When shall we three meet again
In thunder, lightning, or in rain?
When the hurly-burly's done,
When the battle's lost and won.
I come, Graymalkin.
Fair is foul, and foul is fair;
Hover through the fog and filthy air. (1.1.1-13)
The audience might not get a look at the stage directions, but all the clues are here: the women speak in rhythmic, chant-like lines (check out "Writing Style" for a close look at their language); they call out to their familiars—and, since "Graymalkin" was a common name for a cat, the audience would have gotten the reference, sort of like saying, "I come, Crookshanks/ Hedwig calls"; and, finally, they end with that creepy inversion: fair is foul, and foul is fair." Supernatural? Super creepy, at least.