The internet’s latest viral video craze, the Harlem Shake, is just 30 seconds of gyrating fun – but in Tunisia, it has sparked outrage. Conservative Muslims have condemned students who’ve made their own copycat videos, and the education ministry is investigating the principal of a high school where one of many “indecent” videos was filmed.  Animosity between religious conservatives and secularists is growing – in the coastal city of Mahdia, one student received 12 stitches after being beaten for doing the Harlem Shake. Similar violent clashes have been reported in the city of Sfax and the town of Sousse.