When I was working at a public library, books on witchcraft and magic (sorcery, not Houdini-style prestidigitation, which is classified under "magic tricks") were among the ones most stolen.
From what I know of modern witchcraft (which isn't saying much, granted) such an act is supposed to "bounce back", as it were, on the perpetrator threefold.
Not that I believe in that sort of Karmic silliness, myself.