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

 Paranoia slowly took hold in Carter's mind, distorting his thoughts and actions. He found himself constantly resetting his locks, glancing nervously over his shoulder, and flinching at every unfamiliar sound that cut through the silence.How could he protect himself from threats he couldn't see, dangers he couldn't even understand? An overwhelming need for safety consumed him, causing him to consider precautions he'd never realized were necessary.