DOCTOR: He's standing on a box. To my eyes, that box looks very like a sophisticated computer.

SALLY-ANNE: How can you tell?

DOCTOR: Compare it to the rest of this place. All in ruins - a toppled empire. But that box is pristine. Throbbing with energy.

SALLY-ANNE: Yeah. That’s very clever of you to notice that.

DOCTOR: Yeah? Well I am very clever.

SALLY-ANNE: And very sexy.

DOCTOR: And very se—no! No. Let’s not start all that over again.