“Mummy on the Orient Express” quotes from Doctor Who

You're doing it again.

Doing what?

You're smiling.

Yes, I'm smiling.

It's the sad smile. It's a smile but you're sad. It's like two emotions at once. It's like you're malfunctioning.

A man just died in front of us, can we not just have a moment?!

No! No, no, no, we can't do that, we can't mourn! People with guns to their heads, they cannot mourn, we do not have time to mourn!

Well, he has... tried to entice me here before. Free tickets. Mysterious summons. He even phoned the TARDIS number, you know how difficult that number--

So, you knew. You knew that this was no relaxing break, you knew that was dangerous!

I didn't know! I certainly hoped.

Okay, this, you see? This is why I'm leaving you, this, because you lied, you lied to me again. And now you've made me lie. You made me your... accomplice!

Hello! I'm so pleased to finally see you. I'm the Doctor, and I will be your victim this evening! Are you my mummy?

I couldn't risk Gus finding out my plan and stopping me.

So you were… pretending to be heartless?

Would you like to think that about me? Would that make it easier? I didn't know if I could save her. I couldn't save Quell, I couldn't save Moorhouse. There was a good chance that she'd die too. At which point… I would have just moved on to the next… and the next, until I beat it. Sometimes the only choices you have are bad ones, but you still have to choose.

Is it (travelling in the TARDIS) like....

... Like what?

.... An addiction?

Well, you can't really tell if something's an addiction 'til you try and give it up.

And you never have.

Let me know how it goes.