Three elderly ladies were discussing the trials 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 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 responded, "Well, I'm really glad I don't have that problem, touch wood." She didn't just touch it - she rapped her knuckles enthusiastically on the table and then said, "There's someone at the door, I'll get it!"