Rose: That's what mum always says. So, I was thinking... could we? Could we go and see my dad when he was still alive?
Doctor: Where's this come from, all of a sudden?
Rose: All right then, if we can't, if it goes against the laws of times or something, then never mind, we'll just leave it.
Doctor: No, I can do anything. I'm just more worried about you.
Rose: I wanna see him.
Doctor: Your wish is my command. But be careful what you wish for.