​A new form of protest against the government is rocking Iran: a viral dance craze set to an upbeat folk song where crowds clap and chant the rhythmic chorus, 'oh, oh, oh, oh.' Men and women of all ages are gyrating their hips, swirling their arms in the air, and chanting the song's catchy lines, according to videos on social media. People are dancing on the streets, in shops, at sport stadiums, in classrooms, malls, restaurants, parties and everywhere else they congregate.