"Tulpas and Spirit Guides"

The latest fads in internet forums are invocation of Tulpas, imaginary friends who become real and start talking to people as voices in the head. The consequences can be tragic, such as in the Slender Man case where 12-year old girls tried to murder a friend.  Tulpa invocation is in fact an ancient Tantric Buddhist tradition, and these are familiar spirits, demons that the Bible tells us to avoid at all costs.