The ghosts of a middle-aged woman and a precocious little girl help an unwed jazz musician and a bar dancer reverse their bad fortune.
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The phrase "when pigs fly" is an adynaton—a figure of speech so hyperbolic that it describes an impossibility. The implication of such a phrase is that the circumstances in question will never occur. The phrase has been used in various forms since the 1600s as a sarcastic remark.