Rose and her Doctor were strolling through town, pausing now and then to admire the holiday decorations in the shop windows.
"Would you look at that?" the Doctor said nostalgically. He smiled at the bright red bicycle in the window display. "Just like the one you had when you were twelve."
"Close enough, I s'pose," Rose agreed, smiling. "You know, you never did tell me…why did you do that?"
He shrugged, as if it should be obvious. "I came across a beautiful little girl, crying her eyes out in a filthy alley, because some creep had stolen her bike, just a few days before Christmas. How could I not do something about that?"
"But, that wasn't you, nor him, either. It was…" She remembered, now. A man with longish hair that curled a bit, and funny clothes that made her think he must be a walking advert for a Christmas panto. His eyes and his smile were very kind, though. He'd given her his handkerchief, and taken her hand to lead her out of the alley, in search of a policeman. She remembered that he'd talked a bit funny, too. 'Constable, my young friend here has had her bicycle stolen. D'you suppose you might do something about that?'
"That was you?" Rose said, her eyes alight with wonder.
"That was you, Rose Tyler, stealing my hearts, before we'd ever even been properly introduced."