Dark Side of the Horse by Samson for September 20, 2012

Oddly (or even ironically), I don’t recall that story. On the other hand, I do remember “Pie and Punch and You-Know-Whats,” one of Robert McCloskey’s Homer Price stories, that used the jingle from Mark Twain’s 1876 story “A Literary Nightmare” as an antidote.

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The first earworm story seems to be Edgar Allan Poe’s “The Imp of the Perverse” (1845)