I worked on Ghost Adventures for a full season years ago..
I was one of those fools who had to lay down the cable for the cameras power during the “lockdown” as the stars didn’t do it for obvious reasons. One of the episodes with the word “penitentiary” I and another dude rolled the cable at the ground floor and this black mist walked in front of me and hit my baseball cap.
Very interesting.
There’s a house in the neighborhood where I grew up that was built in the 1860’s and the family living there in the last few decades has had several unexplained experiences, such as the sound of footsteps going through the house but nobody was walking through at the time.
I had a few personal experiences while a student at Gettysburg College. One was a quite vivid encounter with what I will swear to my dying day was a Confederate officer.