Jimmy and America's Got Talent winner Grace VanderWaal take turns stuffing their mouths full of marshmallows and trying to guess as many songs the other is trying to sing as they can in 30 seconds.
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Grace VanderWaal and Jimmy Sing with Their Mouths Full
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Grace VanderWaal and Jimmy Sing with Their Mouths Full ─ The Tonight Show Starring Jimmy Fallon
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