An informative article on the cultural phenomenon that is Yu Na Kim in her home country:
For instance, did you know that stock trading in South Korea took a dip during the few minutes or so that Yu Na Kim was skating her short program? Apparently all the stockbrokers abandoned their money-grubbing to watch her skate. You can also see a picture of a massive crowd that gathered to watch her skate celebrates after she wins.
Edited to add: This article from Deutsche Presse-Agentur confirms that trading was halved during Yu Na's free skate as well.