Now Voyager: When confronted with escalating threats by her mother, Charlotte says, "Dr. Jackwith says tyranny is part of the maternal instinct." I was instantly challenged as a mother to realize when the fear of losing control was causing me to "up the ugly" in a vain effort to regain it... and I found instant forgiveness for times when my mother had done the same thing to me.
As Good As It Gets: When she says to Melvin, "I don't think I want to know you anymore. All you do is make me feel bad about myself," I was instantly slammed with the realization that I needed to say that in a relationship I was involved in. Of course in the movie the relationship resolved and in my life it was dissolved...but it's a great litmus test for all relationships.