This can either be a game where we try to guess, or just list our favorite quotes from our favorite movies. I suggest just listing them. Here's one to start it off:
"Years ago my mother used to say to me, she'd say, 'In this world, Elwood, you must be' - she always called me Elwood - 'In this world, Elwood, you must be oh so smart or oh so pleasant.' Well, for years I was smart. I recommend pleasant. You may quote me."-- Elwood Dowd (James Stewart), Harvey.