Three old ladies were sitting at the kitchen table discussing their problems with getting old.
One said, "Sometimes I catch myself with a jar of mayonnaise in my hand, while standing in front of the refrigerator, and I can't remember whether I need to put it away, or start making a sandwich."
The second lady says: "Yes, sometimes I find myself on the landing of the stairs and can't remember whether I was on my way up or on my way down."
The third one says: " Well, ladies, I'm glad I don't have those problems. Knock on wood," as she rapped her knuckles on the table, and then said: "That must be the door, I'll get it!"