I do believe that the poster, Frosty Blue was referring to disturbing images that the mind does know to be real.
I do think in general that images such as Halloween or vampires do provoke some type of stimulus in the minds of most people and fear can also be thought of as a feeling of submission, people enjoy submission. People enjoy the feeling of seduction and thus submission, one reason the sociopath can be so enticing and successful at what they do!
So from that perspective, there is another alternative but for a smaller minority as we were discussing there is a deeper desire that would be considered more taboo in terms of society and not so acceptable. A conversation you may not want to share at the dinner table.