"Anything I can juggle is fine, but I find people are usually more likely to have fruit hanging around than a tennis ball or something." All right, well he'll stand then, because he doesn't like doing tricks with someone towering over him. That makes things slightly intimidating.
John shuffles the cards as he talks, keeping his eyes on Tony. "Right, now, I've got to ask you to empty out that case, cuz we'll need it, and having other bits of paper in there just makes things confusing. After you do that, pick a card and make sure I don't see it. Sort of ruins the magic, see, if I know what it is, too."