WARNING: The following article contains spoilers for WandaVision Episode 7, "Breaking the Fourth Wall," now streaming on Disney+.

"Agatha All Along," the song which revealed neighbor Agnes as Agatha Harkness in WandaVision, received a strong reaction from Marvel Cinematic Universe fans. Now, one viewer discovered a recurring motif between the show's villain song and its opening theme.

Omni Jacala, a graphic designer and video game artist known as Artsy Omni, posted a YouTube video dissecting a musical motif that's in each opening theme song of WandaVision. The sequence consists of four notes and is present in every theme song from Episode 1’s "A Newlywed Couple," in which it appears at the very end in the vocal harmonies, to the Office-inspired theme "W-V 2000," which is compromised entirely of two different iterations of the sequence. The sequence most recently appeared at the end of Episode 7, "Breaking the Fourth Wall," where it acted as a sting to the show’s reveal that the villain was "Agatha All Along."

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The musical sequence is a tritone, or an interval of three whole tones, known as the Devil's Interval, according to the show's songwriters Kristen Anderson-Lopez and Robert Lopez. The duo, who won Academy Awards for their work on Disney films Frozen and Coco, spoke to IndieWire about how they wanted a recurring motif between each of the theme songs while varying it to fit in each decade. "It might feel creepy, sometimes dreamy," Lopez said of the Devil's Interval. Referencing the nursery rhyme from A Nightmare on Elm Street, Lopez said, "One of the techniques of this show is to use a bright and cheery sound, and then juxtapose it with a creepy situation."

Creepy yet cheery is the perfect way to describe Agatha’s villain reveal and her campy musical number. One fan, Twitter user HerrNalle, was inspired by the song and recreated the witch Agatha Harkness as a 60s' Hanna-Barbera cartoon character. The short video showcased a giggling cartoon version of Agatha snapping her fingers and making Wanda's twins disappear. "Welp, I got inspired by the character with the best theme song in the show," the caption read. "So what if #AgathaAllAlong was a Hanna-Barbera show in the 60s?"

Written by Jac Schaeffer and directed by Matt Shakman, WandaVision stars Elizabeth Olsen as Wanda Maximoff/Scarlet Witch, Paul Bettany as Vision, Randall Park as Agent Jimmy Woo, Kat Dennings as Darcy Lewis, Teyonah Parris as Monica Rambeau and Kathryn Hahn as Agnes. New episodes air Fridays on Disney+.

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Source: YouTube