Общий звук

Jake was alone at home late at night. His phone suddenly buzzed. A message popped up from an unknown number. It said: “Don’t turn around.” Jake laughed and looked around his empty room. Another message came. “I’m behind you.” Jake’s heart started beating fast. He slowly turned around… But there was nothing there. Shaking, he picked up his phone again. One last message appeared: “I said don’t turn around… Now you can see me.”