Director Harish Shankar is a die-hard fan of Pawan Kalyan and is currently gearing up for the theatrical release of Ustaad Bhagat Singh, his second collaboration with the actor-politician. However, on Tuesday night, the filmmaker inadvertently stirred controversy after quote-tweeting a Pawan Kalyan fan who wished that Ustaad Bhagat Singh would demolish Mahesh Babu's existing box-office records."Thadasthu," Harish Shankar wrote in response. The post instantly triggered fan wars on social media, even though it was deleted within minutes.