There are many Dances of Joy. (Whoa. That sounded profound.)
I have no idea who this woman is, but I am in awe of her fingers. Her long, long fingers. (Oh, and she's pretty freakin' cute too.)
Here's another video of hers!
(Her videos link to that video of Numfar doing the Dance of Joy, but her Dance of Joy is a much different Dance of Joy.)