India, Jan. 28 -- Following the circulation of videos online of him doing pull-ups inside a Mumbai Metro coach, actor Varun Dhawan, received a warning from authorities. The incident occurred on Saturday, when the actor opted to take the metro for a surprise visit to a cinema hall for the promotion of his latest film Border 2. The 38-year-old then shared an Instagram story, asking fans to guess which theatre he was heading to. The Maha Mumbai Metro Operation Corporation Limited (MMMOCL) later shared the video, with a warning message. (see inset) "Acts like these are punishable under the sections relating to causing nuisance and/or damage to property given in The Metro Railways (Operations and Maintenance) Act, 2002... Travel responsibly on Maha Mumbai Metro," the caption read. HTC...