There was an old couple.

… they noticed that they were getting more and more forgetful and decided to go to the doctor.

The doctor told them to start writing things down so they wouldn’t forget.

They went home and the old woman told her husband to bring her a bowl of ice cream. “She said, “You might want to write this down.

He said, “No, I remember that you wanted a bowl of ice cream.

So the wife told her husband that she wanted a bowl of ice cream with whipped cream. “Write that down,” she said to him.

“No, no, I remember: you want a bowl of ice cream with whipped cream,” he said again.

Then the old woman said she wanted a bowl of ice cream with whipped cream and a cherry on top. She said to her husband, “Write that down.

Again he said, “No, I understand. You want a bowl of ice cream with whipped cream and a cherry on top.”

He went to get the ice cream and spent an unusually long time in the kitchen, over 30 minutes.
He comes to his wife and hands her a plate of bacon and eggs.

The old woman looks at the plate for a while, then looks at her husband and asks,

“Where’s the toast?”