It’s a brilliant moment. Not only does the song bring us up to speed with all of Agatha’s dastardly deeds—including killing Sparky—but it’s also extremely catchy! It has a similar sound to The Munsters theme song. And the lyrics are delicious. Hahn even pipes in to deliver the “it’s been Agatha all along” portion. Revealing herself to be a great singer, among her many other talents.