 In the scene where Aragorn has washed up on the shore of the river  that he fell in when the warg dragged him off the cliff and Arwen  comes to him in a dream to revive him, the dialogue was originally  in English. But Liv Tyler (qv) was entranced by the Elvish  language, and since both characters and actors knew how to speak it,  she talked Peter Jackson (I) (qv) into letting them translate the  script for that scene. Everyone agreed that it turned out much  better her way than the way it had been originally planned.