You know what though - I did have a very odd experience a few years ago - about ten years ago, involving a house I was selling (I was a realtor) and a pentagram on the ceiling. The pentagram was drawn on the ceiling by a teenager who seemed to also be very disturbed - he had written all over his walls in permanent ink and highlighter - all sorts of weird, cryptic messages and lyrics from songs. I didn't really think anything of it (the house was vacant) and a team of painters was hired to paint the house since basically the entire house had been trashed by this very disturbed kid (he had also ripped fixtures out of the house as well).
I got a call from the painters who told me that they refused to work in that boy's room anymore because their Kilz paint primer was not working on the pentagram. I was bemused and went by there and was met by a team of very upset painters, who told me that they had tried to paint Kilz primer over the pentagram six different times and that it kept seeping through the primer and they were scared now.
I couldn't believe it. I marched into that room and looked up and sure enough, you could see all the layers of Kilz and you could see the marker seeping through the primer. It seemed to be the same sort of marker that was used all over the room and that had been successfully painted over.
I asked them to please humor me and paint over it one more time. They painted a portion, and within five minutes it had bled back through.
I was stymied.
I had a crucifix in my car (I was Catholic at the time). I went outside, got the crucifix, and marched back into the room and hung the crucifix in the window. I then said the Lord's Prayer out loud and then loudly proclaimed, "In the name of Jesus Christ I command you to leave this room - you have no right to be here." The painters were all watching me with amazement. I turned to them and said, "There. You should have no problems in here anymore. Please come back in and paint this ceiling."
They did so - the seventh time, and the pentagram was successfully covered.
I did think that was odd - I gotta tell you.