well movies would be very useful but
I understand what you're saying...it will be almost impossible to do.
But with a few basic lessons in Polish vocabulary, films are a great insight into day to day language, the way people realy do speake to one another in various situations.
After studying a film for 2/3 times you realy do begin to hear what is being said, the speach becomes clearer and they don't sound like a gaggle of geese any longer.
In America there is a vast amount of Polish film with english subtitle available. Just google Polish dvd and your'e away......