Once Pa said to Laura and Mary, "Watch, and maybe you can see the weasel pop out this time." "Pop!" said his finger on the string; "Goes the weasel" sang the fiddle. But Laura and Mary hadn's seen Pa's finger make the string pop. He was so quick they could never catch him... Laura Ingalls Wilder Little House in the Big Woods, page 98
Pop! Goes the Weasel (Words and Music Traditional USA)
A Penny for a spool of thread, Another for a needle, That's the way the money goes Pop! goes the weasel! All around the cobbler's bench, The monkey chased the weasel, The preacher kissed the cobbler's wife, Pop! Goes the weasel!