He practically bounced out of the TARDIS, flourishing a paper horn in one hand. A bright purple plastic top hat perched precariously on his head.
"Happy New Year!" he declared as he crossed to her cell.
River arched an eyebrow at him. "New Year?"
He took off his hat and, grinning hugely, pointed excitedly to the words written on it. "Yeah! That's what it says on the hat. A hat... with words! How cool is that?"
She continued to stare at him for a moment, eyebrow raised. When his grin refused to fade, she relented. "Yes, dear, that's wonderful. Except, you realize, it's the third of March."
He waved aside her objection. "Well, yes, of course it is. Here. But I know someone who can get us into the New Year's Eve party. In..." He glanced at his watch. "Three-thousand and sixteen years ago." Pulling out his screwdriver, he unlocked her cell and flung back the door. "Coming?"
"Excellent. Fantastic. Because I've already got you a hat..."
She still went anyway. And even wore the hat.
Ah... The things one does for love.