Black Cat Bone
(to traditionally to be done on Good Friday)
from the Book of St. Cyprian:
"Cook the body of a black cat in boiling water with white seeds and wood from the willow until the meat is loosened from the bones. Strain the bones in a linen cloth and, in front of the mirror, place the bones, one by one in your mouth, until you find that you have the magic to make you become invisible. Keep the bone with the magic property and, if you want to go somewhere without being seen, place the bone in your mouth."