A story
When my wife, Natalia, and I were last in London, we agreed on something before using the subway/underground. If she were left behind, she should wait, and if I were left behind, she should get off on the next stop. On the next day, our agreement was put to the test! Natalia forgot to wait and almost took the next train! However, after a while she decided to stay and wait for me. She must have been terrified!! Maybe we both should have taken our cell phones with us.