Where's Tumpty?

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Tumpty is trying his hardest to hide...will he ever manage to succeed? I'm hiding, said Tumpty. You can't see me! But everyone CAN see Tumpty, upside down under a large cardboard box, behind a pot plant. It's very funny. But later when they really CAN'T find Tumpty - not in the cupboard or behind the curtain or in the biscuit tin - suddenly it isn't funny at all...