I loved this video when I saw it, maybe partially because I could picture myself doing something like this, but also because I think it is a beautiful example that we are all made in the same image of God. No matter where you go we are still similar, and we all seem to enjoy, when we let down our walls, to just let go of our self-seriousness and do some silly dance. When we do, it is a joyful thing. And maybe like in the case of David it could even be an act of worship.
If we share in the image of God, and we are all taken to doing silly dances if we would allow ourselves, then I think it has something to say about God. If all that is good in us comes from God, then He must have also put the desire to dance in us. I think this also tells us something about Him; He is certainly not the stern old man we often make Him out to be. Everything that we find joyful and beautiful in this world, I think is a small glimpse of heaven and his nature. I would not be surprised to think that in heaven there will be a dance party, at least once, with every tribe and nation dancing and singing in their own way in worship.