The Invisible Ones

Have you ever been alone in a room and you felt like there was someone behind you? You make a quick turn to check, but there was nothing. You reassure yourself that you are just being paranoid. You feel this again, but this time, it's worse. It feels like someone is closer to you, about to grab you and do terrible things to you. You turn around once more and you see nothing. You turn back and wonder what will happen next. You realize that your palms are sweaty and your feet are numb. At this point you are terrified at whatever might come, so you decide to make a break for the door and run out of the room as fast as you can and into a safer place.