I wrote a great many new verses of this when I was doing fisher work in California (AKA "chasing weasels,") but I imagine you're looking for something a bit more traditional... the version I learned as a child was:
Round and round the mulberry bush The monkey chased the weasel The monkey thought 'twas all in fun Pop goes the weasel!
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Round and round the mulberry bush
The monkey chased the weasel
The monkey thought 'twas all in fun
Pop goes the weasel!