The Doctor's hands flew to his bowtie, straightening at the same time as his face melted into a deep and sincerely insulted frown. "Bowties are cool," he said. The nerve of his former self. "At least I'm not running amok in the universe wearing Chuck Taylor trainers!" He whipped his sonic out of his jacket pocket and pointed it accusingly at the offending sneakers. "And you want people to take you seriously."
Nevermind, of course, that his own shoes were raggedy, dusty boots that had seen much, much better days and were not at all aided by The Doctor's constant insistence upon running literally everywhere.
"At least I know why I haven't got any eyebrows to speak of." He dropped the sonic back down into his pocket, squinting his eyes and leaning in closer. "Look at those." He gestured with two fingers at his predecessor's brows. "Bushy. Terribly bushy." They weren't, really, but he'd been quite offended about his bowtie. Bowties really were cool.
He waved a hand. "Anyway. Not important. Thing is, I can't find my TARDIS. And I have been wondering--do you have yours? I was just thinking maybe, this being a pocket universe and all, that if your TARDIS is here, it might be blocking mine." He paused. "Then again, it being a pocket universe, maybe neither TARDIS can exist. See, I've been talking to Elizabeth The Librarian--she's quite clever, that one is."
And then he paused, hands curling into fists in mid-air and a profoundly oops sort of expression crossing his face. "Oh, dear. Where are you from? Or, when, I should say. I don't want to give you spoilers. Then again, I don't remember this--so if I don't remember this, does it mean we don't remember it when we get out? And clearly we both have to get out--fixed points, and all that." He put both hands over his mouth. Couldn't go spoiling things, now, could he? Unless he wasn't going to remember, and then he'd have to be very specific.
Otherwise, River Song would show up just to spite him, waving a blue journal resembling the TARDIS in his face and crowing about spoilers, sweety. Not that he'd quite mind seeing River Song... but that was a topic for another conversation, in a different part of town.