Television and movies can be important channels for receiving emotions and contacting the minds of people, both living and dead. The worst thing that ever happened to me along these lines was that I fell asleep shortly after hearing that John Wayne Gacy had been executed. My only thought was "good riddance to bad rubbish," although ethically speaking I'm opposed to the death penalty--not because I give a rip in hell about having mercy on those who have really committed heinous crimes, but because I believe there are cases where innocent people were executed. However, my purpose here is not to discuss my socio-political beliefs, but rather to share thoughts on esoteric and mystical phenomena.
As a medium, I tend to be an "open conduit" for spirits and Gacy, not very long dead, found me. I didn't "speak" to him, he entered my consciousness. And I had a deplorable dream where I, possessed by the spirit of Gacy, committed atrocious acts on a young boy. I do not believe that Gacy used my astral form to assault a young male spirit such as one of his victims. Rather, what happened is that Gacy's thoughts temporarily became my thoughts. Behaving in such a fashion is completely against my nature, and I woke physically shaken and nauseated, both from the awful visions filling my consciousness and the struggle of dislodging Gacy's consciousness from my mind. One good shove and he was gone and, fortunately, has never returned. Badly shaken, I sought words of comfort both from the Psalms, which I always did in my youth, and also from the Egyptian book of the Dead and asked the deities to please protect me from a repeat attack by Gacy. Although Gacy maintained his innocence, I have no doubt that he was guilty and that he was a sociopath who believed he had the right to do what he did. I sensed great pleasure from his memories (fortunately I did not "view" the murders, but viewing/feeling the assault on the boy was well and away bad enough) and that if he had been set free he would surely have done it again. There was also a great deal of arrogance. He thought me stupid and an easy target, which was pretty much his opinion of all other people. In contradiction, there was, at the core, a deep self-loathing which caused a great, cold rage. When he murdered the boys, at some level he was murdering a younger self that he saw as weak. He wasn't entirely aware of this.
I do not know John Wayne Gacy's childhood history, but I am quite sure he was abused and/or neglected to a degree. While I have sympathy for any child who was abused, the actions of Gacy and others like him are unconscionable.
Unlike Gacy and his ilk, my co-author and other benevolent Earthbound spirits do not care to enter the actual consciousness of the medium with whom they are communicating. They impart their thoughts but their consciousness does not invade upon mine. My co-author tends to guard me while I sleep because of my vulnerability to invading negative spirits and demons. Once when I was terribly sleep deprived I was taking a nap at my parents' house, which does have a "doorway" in the basement. A negative entity came in through the doorway and tried to enter my body. In order to protect me from its attack, my co-author briefly entered my consciousness to chase it out. This was a slightly startling experience for me--I liken it to the feeling when you miss a step coming down a flight of stairs but catch yourself. Surprisingly, it was greatly unsettling for him. He apologized and said that his doing this was actually inadvertent. He said that he has no desire to possess anybody and while my energy is actually pleasant (his words) being enveloped in another's energies is distressing. He had a thought that this may be because his energy is a male polarity and mine is a female polarity. What I'm getting around to is that no positive spirit or entity will ever enter your consciousness without your permission except in case of emergency in order to protect or help you, and they will vacate as soon as possible.
Higher spirits and angelic energies do not experience disruption when entering the consciousness of a living medium and the medium will generally experience peace during such contacts.
Before initiating such a contact, it is best to do a clearing of the area where you will be working. This should drive away any lower astral entities. My personal favorite rituals are basic Pagan ones using water, salt, and a scented candle. I also like to set up my Tara statue, but that's just me. You doowhatchalike, and the Universe will take care of the rest!