"That, I think, has to do with trying to make us happy," the Doctor says. "You think about it. First person you've met, seems like they're completely in-sych with you. Like, with me, I ran into Tara. She's exactly the sort of person I'd have made friends with. Down to her hair color." Which is actually very important, if you're the Doctor. "And she's got her friends here. All in order to make us happy. The flat you'll pick out, it'll be just what you want in a flat. Like they plucked it right from your mind."