Nameless

When I rang, Mater turned from the television and answered the telephone.
"I'm watching a film," she told me. "It's really good."
I wished to know the name of the really good film. Mater tried to oblige, but memory failed her. Fragments of names of other films came to mind, but the title in question was not forthcoming.
"Hold on," Mater said, determined to solve the puzzle.
She called to her cousin across the living room. "What's this film we're watching?"
I caught a muffled reply of hemming and hawing and, eventually, of not-knowing.
"We can't remember," she confessed, shocked. "And you won't believe this, but it's a film about Alzheimer's."
I was forced to believe it; and I left her to savour the remainder of the nameless piece of really good cinema.