Bagpuss

Season 1, Episode 2: The Owls of Athens

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Emily brings in a very old, dirty bit of rag, which as ever, Yaffle can see no value in. The mice start to vigorously clean the cloth, before being stopped by Madeleine. She implores the mice to be more gentle with it, and they clean it lovingly, to reveal an old cushion cover depicting an owl. The mice run away, scared by the owl, but come back when they realise it isn't real...