William Perry starts having extreme fits after an encounter with an old woman when he was on his way home from school. His fits are so violent that two or three people cannot hold him down.(46)

William Perry has a fit lasting three days. After drinking holy water, he vomits pins, wool, knotted thread, rosemary, walnuts, feather, and then regains his speech.(48)

William Perry is determined to have faked his possession for attention and gifts.(55)

Joyce Dovey, finding that her Keeper (who had evidently been keeping a written record of her torments), had some kind of written record about her, "fell upon him very violently, and would have taken the paper from him, but he contended with her very toughly." (3-4)