And a couple therapy/mental health-related ones:

"Ann: I want to know why you are the way you are!
Graham: And I'm telling you it's not any one thing that I can point to and say "That's why!" It doesn't work that way with people who have problems, Ann, it's not that neat, it's not that tidy! It's not a series of little boxes that you can line up and count. Things just don't happen that way."

and
"Ann: You know, my therapist...
Graham: You're in therapy?
Ann: Aren't you?"

I'll stop now...