Answer:
Once upon a time, I was in the book store waiting for the clerk to ring up my purchases. As I stood waiting, I spotted a small display of books on the counter; the title was "1001 Senior Moments". I smiled and said to the clerk, "Well, I don't need to buy that book, I live it every day." She stopped, looked directly in my eyes and said, "Oh, you bought it, you just don't remember."