NEW YORK - Jimmy Fallon 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.
WATCH: Grace Vanderwaal and Jimmy sing with their mouths full
Jimmy Fallon 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.
