Ranbir Kapoor was recently mobbed inside a suburban multiplex where he was spotted with director Imtiaz Ali for a test screening of the trailer of Rockstar.

Apparently a group of boys and girls surrounded the star and insisted on watching the teaser.

RK apparently agreed on the condition that they wouldn't film the visuals on their phones. Interestingly the kids who watched the promo went ahead to post their comments on a social networking site for the film, even before the trailer hits screens.