Meaningful movies? As in movies that changed something for me, my way of thinking etc.? Well there are tons of films that are meaningful to me, each in another way. If I have to name some: Taxi Driver had quite an impact on me. It changed my way of thinking in relation to some aspects of life. It changed my view on themes as insanity and alienation, as it gives you the opportunity to place yourself in the mind of someone you think you would never understand. The disturbing nature of it had me analyzing it for days.
A Clockwork Orange: changed my perception of al lot of things: violence, how people change under the influence of society, .. very much in the same way as with the previous film.
Bin-jip. Just.. powerful, without words. This one really affected me emotionally.