Rose Tyler: I can see everything. All that is, all that was. All that ever could be.
Doctor: That’s what I see. All the time. And doesn’t it drive you mad?
Rose Tyler: My head.
Doctor: Come here.
Rose Tyler: It’s killing me.
Doctor: I think you need a doctor.
From Doctor Who – Season 1 Episode 13: ‘The Parting of the Ways’ (1×13)