then, along came flatley. michael flatley. turned this world on its head.90s and riverdance was all we could talk about at my house. flatley cut loose and updated and ancient art form, shirt off, head band on, cheesy smile, check. a form that would last a thousand 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 kitsch. 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, retired riverdance stars. 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, yeah. ♪ ♪ >> reporter: they call themselves up and over it. >> seven, eight. >> reporter: and through the medium of youtube and old-fashioned face-to-face encounters, they'll tell anyone who'll listen that irish dancing can be something else. >> reporter: so you're the second best irish dancer in the wor