

Banks, it turns out is the protagonist of the Mary Poppins story. Banks's own baptism into the magical nanny's alternative perspective. He then utters Mary Poppins' word, a word he had heard his children say. Banks has lost everything, he looks down at the tuppence which his son had given him. The word's repetition throughout the rest of the movie is evidence that Mary Poppins' magic is real, and not just a product of the children's imaginations. That keepsake is the word, 'Supercalifragilisticexpialidocious.' The rain washes all the magic away, but because their collective memories remain intact, the children are able to keep a piece of Mary Poppins' magic. Mary Poppins then, with the greatest of subtlety, gives the children a special, undilutable keepsake, just before it rains and the magic world washes away. When Mary, Bert and the children escape into the magic world of Bert's street pavement pastel drawing, the foursome shares a 'supernatural' adventure. Actually, this song is integral to the plot of the Mary Poppins motion picture. "Many people comment that this song is just a tongue twister and that there's nothing more to it.

The Sherman Brothers wrote this for the Disney movie Mary Poppins.
