In July of 2012 Full Tech was contacted by family that resides on The Circle City: Corona, CA.  The family has been experiencing paranormal activity for the last seven years.  It started with a late night out by the son.  He came home late one night after a movie and left his key inside.  He knocked on the door repeatedly and someone inside the house would imitate the knock back.  The next morning a neighbor asked why the family was imitating the knocks instead of letting the son in.  They never heard the son knock that night and they all claimed they didn't get up to knock on the door.