You are walking down the street, absorbed in your thoughts, following your normal route to work. Someone approaches you from the opposite direction. As you are about to pass them, they suddenly stop directly in front of you, look at their watch, look up at the sky, spin around once, and then ask you, “What time is it?” You stop. Your mind goes blank for a second. You look at your own watch and tell them the time. They thank you and walk away. You continue walking, and thirty seconds later you realize something strange just happened. Why did they...