You're 86, fighting a long battle with dementia when your great grandchild comes into the room playing on their Nintendo Switch 32 deluxe. You catch a glimpse of the little characters, one green and one red. They seem vaguely familiar to you, as if they once were a special memory of yours. You laugh, an expression brought on by sheer instinct from your days of youth. Confused, your great grandchild asks about what's so funny, console in hand.
You can't remember why you laughed.