The only movie that consistently gets me to cry is Armegeddon when the father comes back from blowing up the asteroid and his little boy runs up to greet him.
Inexplicable, I know. Usually I have great taste in flicks.
We watched Armageddon with a household full of teenagers. The part where Bruce Willis is saying goodbye to the daughter made all of the guys tear up. In all fairness, all the girls teared up as well.