Summary: Jack and the Doctor have very different ideas about what's important.
“Jaaaack,” the Doctor drawled, exasperated with his travelling companion. “Priorities! We’re not here for leisure, or whatever you’re planning!”
“I wasn’t planning anything!” Jack turned a look of injured innocence on the Doctor. “I was being friendly. You’d be surprised how much you can learn just by making friends with people. You should try it sometime.”
“I can imagine what you were learning just then, and this isn’t the time.”
“That’s your problem; you never have time for fun. Loosen up a bit!”
“I have plenty of fun, just not your sort of fun.”