As I walked down the 2nd Avenue platform of the F train, I noticed a man moving in my direction who was asking people for change. He looked down on his luck.
He moved near me. I didn't have any change and didn't want to encourage him by making eye contact.
I got the urge to cough and did so.
"You better check out that cough." he said as he sped past me "It could be T.B."