One time I was listening to headphones walking home from the train in the rain after work in a major US city. I had an uneasy feeling and spun around ending up walking backwards. I'm face to face with a stranger who is uncomfortably close to me matching pace. I awkwardly said, "Hi." Then, we were both uncomfortable. Nothing happened. I took my headphones off and continued a few streets to my apartment. Maybe something would of happened had I not spun around.