I would like to tell you about what I experienced once. I am a doctor and I was at the hospital this particular night for a procedure. My friend works at the reception desk and I frequently stand and talk to him there. This night I was standing there and around 7pm most people enquire where patients are because of visiting hours. An old man stood next to me and my friend ignored him. As i wanted to say to him he can help the man first, a young couple stood at the exact spot the old man was. I was creaped out. He just vanished