Not everyone who goes to a Haunted House experiences paranormal phenomena. It is believed that only certain individuals with certain psychic attunements or emotional states are receptive. An Entity is a Ghost or disincarnate being who is able to host the body of one who is a weakened or tired frame of mind. This is known as an encounter phenomenon which involves any number of a wide range of experiences with alternate realities, possessions, channeling, religious conversions, shamanic journeys, UFO abductions, etc. Researchers believe that the unconscious mind determines what kind of an encounter will take place.
Some encounters are so powerful that the person's life becomes permanently changed.
A culture and personal belief may shape the nature of the encounter, so as to reinforce the culture and personal belief. In otherwords, to give one a stronger faith. I have experienced two such encounters and entity possession. One was while driving through the Mink Hills of New Hampshire on my way to my Mother's home. I did not understand what was happening.