So have you ever been in a usually populated place where it seemed that you were the only one there? While walking my dog there was a period of about ten minutes where there was no wind, visible people or any noise. Usually a reasonably busy part of the area where I live, all and any industrial noise was missing, no vehicles of any kind were moving, and looking around, I couldn't see another person. In fairness, it was about to rain but the quietness of the setting gave me the feeling like it was just me left on Earth. Should prepare for zombies tonight?