A young man is jogging through a park when he sees an old man sitting on a bench sobbing. Concerned, he stops by the bench. "Is there anything I can do for you, sir?"
"Oh," sobs the old man, "everything's wonderful. I just married a gorgeous twenty-year old who'll do anything for me, and even my children love her. We have a beautiful house, a pool..."
"So what's the matter?" the puzzled young man asks.
"I can't remember where I live!"
The second lady says, "You think that's bad? The other day, I was sitting on the edge of my bed, and I couldn't remember whether I was going to bed or had just woken up!"
The third lady smiles smugly. "Well, my memory's just as good as it's always been, knock wood." She raps the table. With a startled look on her face, she asks, "Who's there?"