In Reply to: The dark side posted by Victoria S Dennis on December 10, 2009 at 11:15:
: : Where does the phrase "Come over to the dark side" come from?
: In popular speech, it certainly comes from "Star Wars", and the idea of people such as Darth Vader "going over to the dark side of the Force". In his turn George Lucas presumably got it (not necessarily consciously) from Jungian psychological theory, which holds that the unconscious mind has a "shadow" or "dark" side, consisting of one's repressed weaknesses, shortcomings, and instincts. (VSD)
I expect that Lucas also has Pink Floyd's Dark Side of the Moon on his shelves.