Later, Rose has still got questions about their stories, because she still thinks the Doctor even believes in the actuality of police. "So, if you're gonna go with this living plastic -- and I don't even believe that, but if we do -- how did you kill it?" He explains that the thing controlling the plastic gives it life, so by sonic screwing the connection, he killed it. He clarifies for her that this is not radio, but "thought" control, and that throws her off for a few seconds, but she realizes that the next question should be who's doing the controlling, but he just says it's a long story. They joke around about how the entity isn't trying to take over all of the shopping in Britain -- it's not a "price war" -- in a basic joke/joke/serious structure. What really sells it, because the jokes are ciphers, is the acting. Eccleston and Piper have a very natural chemistry, bumping into each other's shoulders and giggling as they walk down the street. He stops her dead: "They want to overthrow the human race and destroy you. Do you believe me?" No, of course not. "But you're still listening." That's all it takes when you're on an epic quest. That's why you should never listen to crazy people with magic powers. She's already in this and she doesn't even know it.
"Really though, Doctor. Tell me. Who are you?" Backed right off that whole genocide thing, I see. The Doctor smiles to himself and approaches Rose: "Do you know what we were saying? About the Earth revolving? It's like when you were a kid. The first time they tell you the world's turning, you just can't quite believe it, because everything looks like it's standing still. I can feel it." He takes her hand and the music goes nuts. "The turn of the Earth. The ground beneath our feet is spinning at a thousand miles an hour, and the entire planet is hurtling around the sun at sixty-seven thousand miles an hour. And I can feel it. We're falling through space, you and me. Clinging to the skin of this tiny little world, and if we let go --" He lets go her hand. "That's who I am. Now, forget me, Rose Tyler." That's also part of the recipe -- when the mysterious messenger is the one to tell you to get lost. He waves the arm in front of her face, hilariously: "Go home." He walks off and she watches him, and then starts down the road, trailing her hand along a fence. The Doctor steps into a police box, and we hear the sound of the TARDIS engines, which we'll come to know well. When I saw my first episode -- which was "The Christmas Invasion," because my friends know what I will like and what I will love -- I couldn't even separate it from the rest of the soundtrack, and I had to be like, "What are they all looking for? How do they know the TARDIS is coming?" It sounds like a dinosaur going, "Wwa whha," or somebody hauling a long length of chain a few feet at a time. Rose runs back to the lot as fast as she can, but it's gone. She stares into the sun, looking around for the Doctor, and then walks off, hands fluttering, at a loss.