There's a rare humorous example of a Type B Stepford Smiler in Annie Hall, with a couple that Alvy Singer approaches on the street for relationship advice:
Alvy Singer: Here, you look like a very happy couple, um, are you?
Alvy Singer: Yeah? So, so, how do you account for it?
Woman: Uh, I'm very shallow and empty and I have no ideas and nothing interesting to say.
Man: And I'm exactly the same way.
Alvy Singer: I see. Wow. That's very interesting. So you've managed to work out something?