Jimmy Fallon invited Emma Thompson to his show to promote Saving Mr. Banks, and something magical happened. Thompson, who plays Mary Poppins creator P.L. Travers in the movie, led the whole audience in a sing-along of "Supercalifragilisticexpialidocious." It's amazing to see Thompson, who plays such a buttoned-up character in the film, cut loose and have some fun. Of course, she must be in a good mood after scoring two major award nominations this week!