Three elderly men were discussing the travails of getting older.
Brian said:
"Sometimes I catch myself with a bottle of ketchup in my hand, in front of the fridge, and I can't remember whether I was taking it out or putting it away".
Martin replied:
"Yes, sometimes I find myself on the landing of the stairs, and I can't remember whether I was on my up, or on my way down".
Roger finally chimed in:
"Well, I'm glad I don't have that kind of problems. Knock on wood".
Rapping his knuckles on the table, saying:
"That must be the door. I'll get it".