After an elderly couple starts getting forgetful, they visit their doctor. Their doctor tells them that many people find it useful to write themselves little notes. When they get home, the wife says, "Dear, will you please go to the kitchen and get me a dish of ice cream? And mabye write that down so you won't forget?"
"Nonsense," says the husband. "I can remember a dish of ice cream."
As the husband was about to prepare his ice cream for the wife, he heard pots and pans banging.
He presented his wife a plate with eggs and bacon, and the wife said, "Hey, where's the toast I asked for?"