JAC: It's an odd world nowadays, isn't it?

CLARA: It's always been an odd world.

JAC: Mmm. I mean, doesn't it feel, sometimes, that things are coming to an end? Everything's just going nuts.

CLARA: You're middle-aged, that's what it is. No offence. Everybody middle-aged always thinks the world's about to come to an end. Hmm. Never does. It's here. Oh, my God.

(A crocodile of school children are being escorted by two women teachers. The TARDIS is standing nearby and the Doctor is sitting on a swing in the designated play area, using his mobile phone.)

TEACHER: Come on, kids, no pushing!

CLARA [OC]: Hi, this is Clara Oswald. I'm probably on the Tube or in outer space. Leave a message! (beep)

DOCTOR: Hello, it's Doctor Disco. I'm in the twenty first century. I don't know what month. I'm staking out some of the most dangerous creatures imaginable.

(Two little girls stop and stare at him.)

DOCTOR: Operating under deep cover. Trying not to attract suspicion. Give me a call, Clara. Nightmare Scenario. I'm worried.

(He follows the little girls to the monkey bars.)

DOCTOR: Okay. Hey, Monster High and Cinderella. Down off the monkey bars. Listen to me. We've got to talk.