Something about the movie, perhaps even subconsciously, triggered some stored/unresolved emotional energy within you.... This is not some random or happenchance reaction - but an indication of something important going on inside, which needs to play out... I strongly feel you should allow yourself to feel vulnerable and uncomfortable - and just let the emotional activity play out... Try to put down your guard and your defenses for the time being, and just explore what's surfacing inside you... It's not likely to make much sense while you're going through it - but it will become clear (and make sense) once you work your way through it and come out on the other side...