Bonetrousle

"Bonetrousle" is the 24th track in the Undertale Soundtrack. It's an extended version of "Nyeh Heh Heh!" with added drums and violin, this song plays after Papyrus unleashes his blue attack.

Trivia

 * According to an interview with Toby Fox, this was one of the six songs originally composed for other projects. The other five were Fallen Down, Heartache, Nyeh Heh Heh!, Another Medium, and MEGALOVANIA.
 * Heartache, Nyeh Heh Heh!, and Bonetrousle were initially made for another RPG idea that never came to fruition.
 * "Bonetrousle" is a made-up word. One of the notes Papyrus leaves to the protagonist after capturing them reads that Papyrus is "slightly bonetrousled" with their previous escape. The context suggests that the word might be synonymous with "worried," "flustered" or "annoyed."
 * In the Genocide Route, the song plays in the pre-battle scene at a significantly slower speed.
 * In the game trailer for Undertale, in the segment where Bonetrousle is played, there is a segment of the theme that was never put into the final game (presuming the part all the way to the ending).
 * It has distinct similarities to Unfounded Revenge from Mother 3, such as the timing and the prelude before the majority of the song.

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