About a year ago, a clip of Gwen Verdon, star of stage and screen, dancing Bob Fosse’s three-and-a-half-minute “Mexican Breakfast” routine to the tune of Unk’s “Walk It Out” appeared on YouTube. Today that clip has been viewed nearly one million times, and inspired a number of imitators. Now Ms. Verdon’s smooth kicking and hip-shaking has been synced to M.I.A.’s “Paper Planes,” Salt-n-Pepa’s “Push It,” and one of my favorites, “Supermodel (You Better Work)” by RuPaul.