This is an over simplification, but it gets the point across. While not true polarization (All rays travelling along the same plane, in the same direction and angle) It can be quite dramatic. A polarizing filter (some films, sunglasses, etc.) will dramatically alter the characteristics of already semi-polarized light.
WHEW!!! So.........In short, FilmBlazer is right tell the custy "I would tell the customer to enjoy the pretty colors because you can't do to fix it "
Come on key, let's hear the whole thing! Good post man.