He looks extremely ruffled for a second, before crossing over into eerily calm territory. It's like a switch got flipped; one second he's on the verge of panic, the next he's leaning back into the seat with a carefree smile, having apparently decided (though maybe not consciously) that the best way to be in control of a situation is to act like you're in control.

"No need to get angry!" he says, and when he next speaks he has the good sense to sound at least somewhat apologetic. "Listen, perhaps I was a bit hasty -can you blame me, really, it's not every day you see such a beautiful automobile- but what I told you before is a hundred percent true. If you really did come here because of unrelated matters, well... It appears our meeting today is purely accidental! Oh, how mysterious the tides of fate!"

There's a hint of sadness here, but it's drowned under the sheer fruitiness.