“For instance, if you woke up in the middle of the night and saw a masked woman trying to crawl through your bedroom window, you might call your mother or father to help you push her back out. If you found yourself hopelessly lost in the middle of a strange city, you might ask the police to give you a ride home. And if you were an author locked in an Italian restaurant that was slowly filling up with water, you might call upon your acquaintances in the locksmith, pasta, and sponge business to come and rescue you.”