I thought the strangest thing that would happen on my flight was a stranger demanding the window seat I had paid extra for. Then the woman accused me of pushing her nine-year-old son, even though I had never touched him. Her story began falling apart when the boy quietly admitted that his mother had shown him a picture of me. I had never met either of them, so I asked him why she had my photograph. He looked frightened, glanced toward his mother, and leaned closer to whisper five words that completely changed the situation.

“She knows where you live.”