Man gives hitchhiker a lift home-and is shocked by the news the next day

 The voice echoed in Carter's mind, a dark warning that never faded, and he felt more vulnerable and exposed than he had ever been in his life, as if hidden danger lurked around every corner.The feeling of being watched became unbearable and followed him around all day. Shadows moved menacingly, and the ringing of his phone sent dread racing through him, as if the next warning was just around the corner. The world seemed to shrink, and the weight of an invisible presence seemed to bear down on him.