Nora & Conan

You may have seen Nora, the piano-playing cat on YouTube. (One clip has had more than 3 million views.) Well, Nora made a "guest" appearance on Late Night with Conan O'Brien this week, as shown in the clip above. The sketch didn't go exactly as planned. Herding cats -- or getting them to play the piano -- is never easy, but it can be funny.