In 2007 the cable station A&E decided to try out their "inner sanctum" advertising on street people in NYC for the show "Paranormal State" - RECAP: An A&E Billboard 'Whispers' a Spooky Message Audible Only in Your Head in Push to Promote Its New 'Paranormal' Program. New Yorker Alison Wilson was walking down Prince Street in SoHo when she heard a woman's voice right in her ear asking, "Who's there? Who's there?" She looked around to find no one in her immediate surroundings. Then the voice said, "It's not your imagination." - ***and this technology has since moved into the consumer category to alarming  degrees, ****much more at url