Goodbye Mom

A young man shopping in a supermarket noticed a little old lady following him around. If he stopped, she stopped.
Furthermore she kept staring at him.

She finally overtook him at the checkout.

She turned to him and said,
"I hope I haven't made you feel ill at ease; it's just that you look so much like my late son."

He answered, "That's okay."
"I know it's silly, but if you'd call out "Good