Reminds me of: Old couple worried about their memory, go to a doctor. He does some tests, tells them not to worry, but to get little note pads and start writing things down. They do, it's working well. One evening they're watching tv. Wife gets up, says I'm going to get some ice cream, would you like some? Husband says Sure! And with some caramel sauce on top. Wife heads toward kitchen, husband says You didn't write it down! Wife says, Ice cream, carmel sauce. I can remember. A few minutes later she come back, hand her husband a hot dog. He looks at her and  says, Honey, you should have written it down. You forgot the mustard!