Imagine the scene: it’s late afternoon, and a man in his early forties is at home alone in his flat, working quietly. Suddenly he hears the doorbell ring, so he gets up and answers it. He opens his front door, only to see a salesman who immediately asks him “Are your parents at home?” Then, before the man can reply that his parents aren’t anywhere near, and that this was his flat, the salesman turns his back and walks off. Now, if that happened to you, wouldn’t you be irritated, or would it at least strike you as very, very weird?