Primeval, Series 1

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?