"What the matter?"
"I just have a feeling."
"He's lying there peacefully, Mummy, don't bother him."
"No," I said triumphantly, reaching down between Billy's guilty paws and removing an object. "He's not just lying there. He's secretly eating ... this!"
I raised the thing in the air and laughed. Billy had somehow got hold of the skin of half of an avocado, a little dark green cup that he had...