It is so uncomfortable watching this!
We've seen her do plenty of interviews before and she actually is VERY calm and collected, so this is just bizarre!
Even when Carrie Bradshaw was her quirkiest, she wasn't this zippy-zappy!
What the hell is going on here, Sarah Jessica Parker?
David Letterman looks like he's in pain!
Was she really nervous? Was she super tired?
Really, how DOES she do it?
Watch it (above) so U can see what we're talking about!