This trailer for Saving Mr. Banks is priceless — it's a film about the making of Disney's Mary Poppins movie, with Tom Hanks inhabiting Walt Disney's eagerness to make the picture and Emma Thompson as author P.L. Travers, who absolutely does not want her wonderful book besmirched.

There are so many lovely moments in this film, and the fact that you know Mary Poppins turned out to be a pretty terrific film in its own right doesn't stop you pumping your fist when Thompson stands up for the principle of Getting It Right.