Knock on Wood

Three older ladies were discussing the problems of getting older. One said, "Sometimes I catch myself with a jar of mayonnaise in my hand, in front of the refrigerator, and can’t remember whether I need to put it away, or start making a sandwich.

The second lady chimed in, "Yes, sometimes I find myself standing on the stairs and can’t remember whether I was on my way up or on my way down."

The third one responded, "Well, I am glad I don’t have that problem; knock on wood," as she rapped her knuckles on the table. She looked up and said, "That must be the door, I’ll get it!"