The Chronicles of Narnia: The Lion, The Witch, and the Wardrobe (2005)
In order to keep things genuine and real, the directors kept a lot of things a secret until they began filming for the younger kids. When George Henley first saw Mr. Tumnus (the goatman!), that was really her first reaction! She had not seen James McAvoy in his costume and was actually scared. Her reaction to Narnia was also real as she had not seen the set yet.