I've seen the chant "One of us! One of us!" parodied in both South Park and Big Bang Theory.
Where does it come from?
Is "Gibble Gobble Gibble Gobble" (added by South Park) part of the original chant?
Tod Browning's controversial cult horror film Freaks from 1932.
The central story is of this conniving trapeze artist Cleopatra, who seduces and marries sideshow midget Hans after learning of his large inheritance. At their wedding reception, the other "freaks" announce that they accept Cleopatra in spite of her being a "normal" outsider; they hold an initiation ceremony in which they pass a massive goblet of wine around the table while chanting, "We accept her, we accept her. One of us, one of us. Gooble-gobble, gooble-gobble."
Cleopatra tries to poison Hans, and when the circus "freaks" find out,
they take their revenge by turning her into a duck woman - into "one of them".
The dinner scene was referenced in many other films and shows. Here it is:
No, it doesn't come from that movie. Most people today have never seen it. It comes from I, Robot 2004. http://www.bing.com/videos/search?q=I+robot+one+of+us&view=detail&&mid=037CC7793439FFC7C8DE037CC7793439FFC7C8DE