My daughter made up a card game and played it on the floor, against a plastic lizard.
"I think I'm winning at Pingo," she said after a while.
"That's good," I said. "I don't want that lizard to win."
It's never too early to learn to play a made-up game, against yourself, and take it quite seriously.
That's pretty much life, come to think of it.
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Postscript: She just made me play Pingo with her. Worst. Game. Ever.