Kristen Bell of Frozen (and so much more) on Ellen explains the video of herself sobbing and stating that she's "So excited," which was taped by her husband Dax Shepherd of Parenthood.
This video is hilarious and so sweet at the same time because clearly her husband loves her very much to do something so sweet.
I originally saw this video on the news when they were talking about why people cry when they are happy or laugh when they are sad. According to them your body is trying to counteract extreme emotions.