OGIC has undertaken a massive summary of the movie quote game. The most cited film was Casablanca. Tied for second were Dr. Strangelove and The Big Lebowski (further proof that Lebowski is now indelibly quilted into the cultural fabric).
However, I’m really curious about the films that were only quoted once: the fun little gems and cult movies that remained in everyone’s subconscious.
(For what it’s worth, Quote #6 would have probably been “I have come here to chew bubblegum and kickass, and I’m all out of bubblegum” from They Live, “Let’s order sushi and not pay” from Repo Man, “Oh Mr. Travis! Try not to die like a dog!” from O Lucky Man!, “You say to yourself ‘How hot can it get?’ And then in Acupulco, you find out.” from Out of the Past, or “They’re coming to get you, Barbara!” from Night of the Living Dead.)