A friend and I were talking about how both our mothers were losing their memories - to the point where they sometimes did not even recognize family members. But we both observed that while our mothers might not be able to remember our names, they still remembered some things quite well, and sometimes with humorus results. To illustrate this point, he told of this incident, which his wife confirmed so I presume is true:
He had rented the movie "Titanic" to watch one night with his wife, daughter and 80+ year old mother. Because grandma no longer recognized her family, and had no short-term memory left at all, they weren't sure what sense she was making of the movie. As if to answer them, she shook her head in disbelief at one point and said, "With all the trouble they've had with that boat, I'm surprised anyone will ride on it anymore."