Good bye Mom :) Funny story

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

"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 just died recently."

"I'm very sorry," I said to her, "Is there anything I can do for you?"

"Yes," she said, "As I'm leaving, can you say 'Good bye, Mom?' It would make me feel so much better."

"Sure," I said. An odd request, but no harm would come of it.

As the old woman was leaving, I called out, "Good Bye, Mom!"

As I stepped up to the checkout counter, I saw that my total was $1027.50.

"How can that be?" I asked, "I only purchased a few things!"

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