dated a girl that was one, I believe they do exist...she was a oh me, always negative wanting to pick a fight over the smallest things till she got a rise out of me...once she got me angry enough to tell her off, she would get her fix of what she needed, my anger and fuss, she would be back to normal...I would feel drained though, it was a roller coaster trying to figure out what was happening. she was demon infested person, that feed on others.