Fiddlesticks!

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Just in case you wondered where Fiddlesticks came from:

Fiddlesticks are traditional instruments used to add percussion to old-time and Cajun fiddle music, allowing two people to play the fiddle at the same time. While the fiddler plays in normal fashion, a second person uses a pair of straws, sticks, or knitting needles to tap out a rhythm on the strings over the upper fingerboard (between the bow and the fiddler's fingering hand).

As an interjection, "Fiddlesticks!" was commonly used in the past as an expression of mild derision, disbelief, disappointment, or frustration.

Source: https://en.wikipedia.org/wiki/Fiddlesticks