Now then, this is something that has completely bowled me over. When I saw Riverdance for the first time, I was amazed to say the least. The beauty is that no matter how many times I see it, I am still just as enamored and overawed by the sheer art, chemistry and co-ordination among all dancers.
For the uninitiated, here's a backgrounder: http://en.wikipedia.org/wiki/Riverdance
And just to etch this in your memory forever, here's a clip of a Riverdance performance - A Must See: