Poor old Jimmy Corden: Stuck in LA traffic, late for work…when oh look, it’s a woman in a face-obscuring wig that may or may not be Sia. In she hops, and luckily they segue straight into a duet of the Aussie mystery woman’s hit ‘Chandelier’ and quickly confirm it is in fact her when she hits the track’s near impossible high note. James Corden…not so much.