What would you do if you were walking along a busy street and suddenly heard a voice whispering in your ear?  Would you be afraid?  Angry?  Worried?   People walking along Prince Street in SoHo were confronted with that situation back in 2007 when A&E was promoting a new show called “Paranormal State.”  The billboard campaign used audio technology that could only be heard by individuals, not a loud speaker…the voice said, “Who’s there? Who’s there?  This is not your imagination.”  It sounds like a great way to draw attention to a show about ghosts, but probably was quite scary to those unaware any such technology was being used, especially if the person was passing by at night!   Paranormal State follows a team of investigators from Penn State University as they explore buildings where people claim to have experienced ghosts.  For the full article, click here.