Three older ladies were discussing the problems of getting older.
One declares, "Sometimes I catch myself in front of the refrigerator with a jar of mayonnaise in my hand and can't remember whether I'm putting it away or taking it out."
The second lady chimes in, "Yes, sometimes I find myself on the landing of the stairs and can't remember if I'm on my way up or down."
The third one responds, "Well, I'm glad I don't have that problem, knock on wood," and she raps her knuckles on the table. "That must be someone at the door, I'll get it!"