Maybe that's because I believe I've seen the real thing in a few people, one of whom I visit every few years. I won't go to her more than that because she gives so many specifics that it almost takes the fun out of life. She's told me I'm with one of my soulmates (which I found quite tolerable—this idea of several soulmates for each of us) and she's also said I'm an Indigo Crystal Child, which is her explanation for what makes me psychic.
In old-line Spiritualism, a portion of the services, generally toward the end, is given over to demonstrations of mediumship through contact with the spirits of the dead. A typical example of this way of describing a mediumistic church service is found in the 1958 autobiography of C. Dorreen Phillips. She writes of the worship services at the Spiritualist Camp Chesterfield in Chesterfield, Indiana: "Services are held each afternoon, consisting of hymns, a lecture on philosophy, and demonstrations of mediumship."
The physicist Kristian Birkeland exposed the fraud of the direct voice medium Etta Wriedt. Birkeland turned on the lights during a séance, snatched her trumpets and discovered that the "spirit" noises were caused by chemical explosions induced by potassium and water and in other cases by lycopodium powder. The British medium Isa Northage claimed to materialize the spirit of a surgeon known as Dr. Reynolds. When photographs taken of Reynolds were analyzed by researchers they discovered that Northage looked like Reynolds with a glued stage beard.