The latest song promo from Farah Khan's 35-crore 'Diwali' release, Om Shanti Om, is basically a tribute to the 80s disco era, aptly titled 'Dard-e-Disco'!More than the song, what is noticeable is that it is after six long years (Ashoka) that Shahrukh Khan has bared his body for his home production, Om Shanti Om.