" I am not sure who started this chicken-and-egg problem, but as we consumers encounter offensive service, we become angrier and tend to take it out on the next service provider—whether or not he or she is responsible for our bad experience. The people receiving our emotional outbursts then go on to serve other customers, but because they are in a worse mood themselves, they aren’t in a position to be courteous and polite. And so goes the carousel of annoyance, frustration, and revenge in an ever-escalating cycle. "

― Dan Ariely , The Upside of Irrationality: The Unexpected Benefits of Defying Logic at Work and at Home