I got a new tablet recently. I use it only to read PDF while I sit on the front porch smoking cigars (well--I did use it to follow the attempted fascist coup). Today Danny notice that the background is Knopff's Oedipus and the Sphinx and asked what it was. So I told him the story, ending it this way:
And the people so loved Oedipus for freeing them from the Sphinx that they made him king, giving him the wife of the old king Laius, Jocasta. And they all lived happily ever after.
I didn't want to spoil it when he first sees or reads the play.