The story behind this funny phrase is that it's an alternative translation of "The rain in Spain stays mainly on the plain" from My Fair Lady.
The point of the latter phrase is that it has a lot of similar-sounding words in it, so for Danish stage adaptations of the musical, an alternative phrase had to be invented, as a literal translation would have ruined the point.
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The point of the latter phrase is that it has a lot of similar-sounding words in it, so for Danish stage adaptations of the musical, an alternative phrase had to be invented, as a literal translation would have ruined the point.