Balthazar reaches out for the card, shakily. Shakily because he's trying very hard not to giggle. It would completely ruin his image (what there is of it to ruin ... further ...?). When he has himself mostly under control, card safely tucked away, he offers Jack one of his own in return.

"I usually ask for a certain amount of choice from the ... donater," he remarks, laughter lurking in his voice. "Not complete freedom of choice, of course, as I hardly want to end up with the memory of the largest rubber band ball you ever constructed. But that would just be cruel now, wouldn't it? Don't trouble yourself, Jack, we'll work out those details in private, hmm?"

They make a funny little triangle, Balthazar looking at the Doctor, the Doctor looking at Jack, and Jack at Balthazar.