Helen and Stephen in “Unfinished Business”

Helen

[having snuck up on Stephen] In most eras of the world's history, you'd be dead by now.

Stephen

Helen. Now what the hell are you doing here?

Helen

You know, all this urban living has made humans such lazy animals... secondary hearing, no sense of smell, no worthwhile instincts.

Stephen

Man has no predators. We have nothing to be afraid of except... each other.

Helen

Well that used to be the case; but times are changing, aren't they, Stephen?