michael flatley. turned this world on its head. and riverdance was all we could talk about around my house. flatley cut loose and updated an ancient art form shirt off, headband on. a form that would last another 1,000 years. then, we noticed this on the internet. sacrilege. their arms are moving. the glum faces are back but they're sitting down there's even irony, intentional kich. i promised myself i would never use the phrase internet sensation again. i just have. music, by the way, is yolanda be cool and d cup. the dirty dancers, tired of riverdance. so, you're not just doing this because your legs don't work so well anymore? >> we do dance with our legs, as well. >> reporter: do you? >> absolutely. >> reporter: they call themselves up and over it. and, through the medium of youtube and old fashioned face to face went counters will tell anyone who will listen that irish dancing can be something else. so, you're the second best irish dancer in the world for your age. >> yes. >> reporter: congratulations. >> thanks. >> reporter: w