Alia Bhatt and Shah Rukh Khan's favourite pastime on the sets of 'Dear Zindagi'?

Alia Bhatt says she is most comfortable in front of the camera and Shah Rukh Khan's passion for acting needs no mention. So what happens in between the breaks when these two filmy keedas meet each other and have to while away time?
Alia Bhatt while interacting with Bombay Times revealed how Shah Rukh Khan and she would spend their break time watching films. She says 'We watched a movie together called 'Trumbo' on the sets of 'Dear Zindagi'.We would watch it for half an hour every day between lunch breaks. Since it was very hot there, we would usually sit inside Shah Rukh's vanity van and watch the film in parts.'
When asked if she has completed watching the film Alia says, 'We promised that we would not complete it without each other but then again he went ahead and he completed it.'