“Hey diddle diddle” is a fantasy rhyme designed to delight children with impossible images such "the Cow jumped over the Moon!" The phrase "Hey diddle diddle" can be found in the works of Shakespeare and was a colloquialism used in much the same vein as "hey nonny no" which can be found in traditional English folk ballads. The original title was "High Diddle Diddle" but this has been altered to "Hey Diddle Diddle" over the years with changes to the English language. The first known date of publication for the words of the “Hey diddle diddle” rhyme is 1765.
Hey diddle diddle, the cat and the fiddle,
The cow jumped over the moon.
The little dog laughed to see such sport
And the dish ran away with the spoon!
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