Who's at the Door?

Jon left his room. It was strange walking down the hallway naked. Walking around naked in his bedroom was one thing, but walking around naked in his *house* was another. As he walked down the stairs, he heard someone knocking on the front door. His first impulse was to answer it. His second impulse was to cover himself up *before* answering it. But then he remembered that he didn't need to. Nudity was normal now. He had nothing to be embarrassed about. So, he opened the door and saw ...