The "when pigs fly" idiom is apparently derived from a centuries-old Scottish proverb, though some other references to pigs flying or pigs with wings are more famous.
when pigs flypigs with wingsflying pigswhen pigs fly idiompigs in the skyimprobabilitywhen pigs fly duffel baghappy flying pigsflying pigs duffel bagsmiling pigs bag
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when pigs flypigs with wingsflying pigswhen pigs fly idiompigs in the skyimprobabilitywhen pigs fly duffel baghappy flying pigsflying pigs duffel bagsmiling pigs bag
