It was the subject of discussion for at least 20 minutes after I arrived and others kept arriving. The cough of a fellow passenger on the Subway. Whether they covered their mouth, how many times they coughed, were you sitting next to them, are you now feeling ill. It is amazing to watch it happen. A person coughs and everyone in the car turns toward them with very watchful eyes. And the watchful eyes are waiting to see if the cough is going to be repeated. It is a vicious cycle.