I mentioned Hand Dancing briefly in class yesterday. It was such a brief mention I don't think anyone would remember it. Hand Dancing is an offshoot of swing dancing that's as far as I have observed completely regional to Washington, DC.
Here's an example of what has now become known as Old School Hand Dancing:
Lately Hand Dancing has taken on a lot of influence from West Coast Swing. The modern movement in Hand Dance is dancing to more modern music. Here's a bit from last year's US Open, just under a year ago: