You've probably seen this by now, as it's gone viral, but in case you haven't, check out this video called T-Mobile Dance. If you liked the Frozen Grand Central, you'll love this. I defy you to sit still while you're watching it. I still have a smile plastered on my face.
And here is how it was done. I'm telling you, watching the non-professional dancers practice at home is hysterical, as is the older woman saying she was picked to do a waltz, because of her gray hairs, but "I can do the other stuff." And then she DOES! LOVE her: