My daughter told me this one... true, funny, but sad.
She was on a video conference to a colleague (both in their own homes) when the colleague's father, who suffers from dementia, walked into the room with a newspaper in one hand and a cup of tea in the other. He thrust the newspaper in front of the screen and asked "What's this Covid thing". His daughter said, "It's an illness, a bit like a very bad flu" . He thought for a moment and said, "Oh, its blue. Well that's OK" turned and left the room.