'Karan Arjun' director Rakesh Roshan shared how Salman Khan and Shah Rukh Khan once faked an argument, following which the former pretended to shoot at Shah Rukh. "He just casually shot a bullet, and Shah Rukh fell," he added. "I remember I said don't do this...Is this a joke? Someone might get a shock and die on...set," Rakesh further said.