A young man was walking through a supermarket to pick up
a few things when he noticed an old lady following him around.
Thinking nothing of it, he ignored her and continued on. Finally
he went to the checkout line, but she got in front of him.

"Pardon me," she said, "I'm sorry if my staring at you has
made you feel uncomfortable. It's just that you look just like
my son, who I haven't seen in a long time."

"That's a shame," replied the young man, "is there anything I
can do for you?"

"Yes," she said, "as I'm leaving, can you say 'Good bye, Mother!'
It would make me feel so much better."

"Sure," answered the young man. As the old woman was
leaving, he called out, "Good bye, Mother!"

As he stepped up to the checkout counter, he saw that his
total was $127.50. "How can that be?" he asked, "I only
purchased a few things!"

"Your mother said that you would pay for her," said the clerk.