It was pretty hilarious. von Trier getting more and more tangled in this pretty thoughtless attempt at a joke, you see how uncomfortable he is, he knows what a mess he's getting himself into, but he can't really stop, Kirsten Dunst getting increasingly uncomfortable, blushing and subtly trying to get him to shut the fuck up... and Stellan Skarsgård trying not to laugh out loud. I mean, it doesn't even look like an attempt at provocation. Just ostracizing him like that, a bit of an overreaction.
But it made my day.