A US student with a rare genetic condition became an online star - by playing Coldplays Clocks with his back to the piano. Evan Petrone filmed himself sitting down, facing away from the keyboard, before twisting his arms into a seemingly impossible position to play the tune. Mr Petrone has Ehlers-Danlos Syndrome which means he has unusually loose joints and ligaments. Ive always been able to bend my arms all over the place, he said. And I eventually began to wonder if I could play piano backwards. Mr Petrone said he chose the song because it was simple and repetitive, but it still took him more than five hours to master. I had to force my brain to play in a completely different way, and it was extremely difficult, he says. You can tell there are still mistakes in the video. ON