Where a a little white girl in a stroller pushed by a brown-skinned nanny sings, "Da-da-yeinu... Da-da-yeinu..." and a white boy walking to school in the opposite direction, dragging his wheeled-school bag behind him, sings back to her, "elu hotzi hotzianu hotzianu mimitzrayim..." and the boy and girl smile at one another but the nanny scowls and walks faster.