My Mother (as if deeply outraged ): I don't know what this is!
Me: It's Pointless.
My Mother: I don't know what that is.
Me: It's a quiz show. You watch it every evening.
My Mother :*goes off into a peal of happy laughter as if to say "Silly me!*
Mostly we tiptoe round her forgetfulness, but perhaps we shouldn't. When I challenge her- as above- it seems to bring her to life (briefly). I don't know. I really don't.