From the movie "Army of Darkness" His screen name is a line from the movie and the main charachter. :)
From the 1951 movie The Day the Earth Stood Still.
I'll never forget my father taking us to this when it opened and hearing Helen (Patricia Neal) say "Klaatu barada nikto" to the robot Gort to get him to rescue Klaatu (Michael Rennie), the man from outer space.
This was such a famous phrase with my older generation that it has been copied evidentally in later movies like Army of Darkness. Lucus named three characters in Star Wars using the 3 words in this sentence.