Syncro Vox in the Simpsons

According to TVTropes, in The Simpsons episode "It's A Mad, Mad, Mad, Mad, Marge", Marge is declared insane. On the "Krusty the Clown Show" Krusty does Conan O'Brien's bit with an image of Marge with Sideshow Mel's mouth crudely superimposed. "She" responds to Krusty's question of who her favorite Native American warrior is with "Crazy Horse." Krusty realizes the bit is getting old and calls for the Mad Marge dancers.

I had to cut off the Mad Marge dancers just to show you this scene. But yes, there existed animated Syncro-Vox, especially in the Simpsons. TBH, it's less terrifying than the live-action mouths on animated characters.

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