Bollywood megastar Amitabh Bachchan usually never indulges in a war of words, especially on social media, but this time it seems Big B has been angered by the antics of controversial poet turned politician and Aam Aadmi Party leader Dr Kumar Vishwas. A Amitabh Bachchan fan club posted a video of Dr Kumar Vishwas singing Harivanshrai Bachchan's poem 'Nind Ka Nirman'. The veteran actor was also tagged in the same post and it did not go down too well with him to see his late father's song being used for making a video. He immediately replied saying that it was a copyright infringement and that the legal team would take care of it.