I Make Myself Invisible in Articles by Aleister Crowley.

“Later, when I was transferring my apparatus to my house in Scotland, I employed two workmen to remove the mirrors. As they were working they were suddenly overcome, knocked out by unseen assailants. It took several hours to revive them.

People passing the doorway suddenly fell down in fits. That flat remained without a tenant for years after I had left it. All this was because I had not enough experience to control the forces.” [via, also]

Consider also:

  1. Gnostica
  2. “Then the fun began. We saw–and my teacher was able to identify–hundreds of shapes, weird “half-formed faces” which were thronging the room, marching in fantastic dance about its confines. These were definitely malicious forces, demons, which one had to study and conquer.”
  3. “They had curious effects on the neighbourhood. Part of the main road from Inverness to Fort Augustus ran through my estate. Soon superstitions about the road made the natives avoid it. People refused to use it after nightfall. Even the tough, hard-drinking workmen from Glasgow who were employed at Foyers would go a long way round to avoid that uncanny road.”
  4. “Spiritualism–more correctly, spiritism–is not a form of black magic.”
  5. “Through their mediumistic acts, spiritists sometimes get hold of disintegrated pieces of the mental apparatus of a man or woman who has died recently.”