I don’t remember the last time I laughed as loudly in a theatre as I did watching Doctor For a brief while, a few minutes into Sivakarthikeyan’s latest film, Doctor, I wasn’t sure if I’d stepped into a Selvaraghavan film by mistake. The protagonist, Varun (Sivakarthikeyan), sits quiet, staring mirthlessly at his fiancee, Padmini (Priyanka Arul Mohan),…