A good one which has passed our way many times in the past.
The most popular ending was...
Naturally, I bought my grand-children ice cream at the end of the meal.
My grandson stared at his for a moment, and then did something I will remember the rest of my life.
He picked up his sundae and, without a word, walked over and placed it in front of the woman.
With a big smile he told her, “Here, this is for you. Ice cream is good for the soul sometimes; and my soul is good already.”