Interesting bit of LOTR trivia: Royd Tolkien, the great grandson of John Ronald Reuel Tolkien (1892-1973), author of The Lord of the Rings trilogy as well as numerous other books in the series, made a cameo in The Return of the King. He played a Gondorian ranger wearing Aragorn's wig in the ruined city of Osgiliath handing out spears to the troops in preparation for battle with Sauron's minions.

http://news.bbc.co.uk/1/hi/entertainment/film/3324387.stm