Sitting in a restaurant by the bay, Captain Jack tells the crew and Mickey some bizarre story (fifteen-person naked party, interrupted by a six-foot creature with tusks) that's got them all laughing and hopping in their seats. Mickey steps on Jack's punchline, but it's okay, and Rose gets rather annoyingly exuberant about "I don't believe a word you say, ever! That is so brilliant!" The Doctor notices some old guy reading a newspaper nearby, and his smile fades. Jack continues the story (he ran away) and the Doctor fully snatches the paper out of the dude's hands, staring at the front page: "And I was having such a nice day." He shows it to Mickey and Rose: "New Mayor, New Cardiff" is the headline, and below it, there's Margaret warding off the photographer. I had no idea journalism moved so fast in Cardiff -- that was like ten minutes ago!
And then there is a very badass moment with the four of them striding up the steps of Town Hall, like the credits of a Joss Whedon show, to the tune of purposeful techno -- which means they're about to pull something off. They stop at the first, broad landing, and Jack delivers a short ops brief: "According to intelligence, the target is the last surviving member of the Slitheen family, a criminal sect from the planet Raxacoricofallapatorious, masquerading as a human being, zipped inside a skin suit. Okay, plan of attack: we assume a basic 57-56 strategy, covering all available exits on the ground floor. Doctor, you go face-to-face, that'll designate Exit One, I'll cover Exit Two, Rose, you're Exit Three, Mickey Smith, you take Exit Four. Have you got that?" The Doctor watches Jack say these things, and across his face is written the words, "Say what, bitch?" Rose is like, "We do plans now?" and Mickey's just trying to remember if he's wearing shoes. The Doctor sternly interrupts Jack, who apologizes: "Awaiting orders, sir." Captain Jack is really all things to all fetishes, isn't he? The Doctor gets very authoritative and then, inevitably: "Right. Here's the plan. ...Like he said. Nice plan. Anything else?" This last with the exact grin you're thinking of. Jack calls on them to "present arms," and they all pull out their cellphones, checking whether their speed dials are set correctly. Jack says with a grin, "See you in hell!" and they all take off immediately for their assigned exits. Except for Mickey, who is generally a little bit slow.