Finally, what shall we think about those witches who somehow take members in large numbers—twenty or thirty—and shut them up together in a birds’ nest or some box, where they move about like living members, eating oats or other feed? This has been seen by many and is a matter of common talk. One should say that it is all brought about by the devil’s work and illusion. The senses of the witnesses are deceived in we have mentioned above.
A man reported that he had lost his member and approached a certain witch in order to restore his health. She told the sick man to climb a particular tree where there was a nest containing many members, and allowed him to take any one he liked. When he tried to take a big one, the witch said you may not take that one, adding, because it belonged to a parish priest. (Malleus Maleficarum Part II, Question 1, Chapter 7)
(Source: foie, via 3liza)