Mark Ruffalo, the 49-year-old star, who plays Bruce Banner/Hulk in The Avengers film franchise, inadvertently let the audio from the superhero movie kept playing at the world premiere of Thor: Ragnarok forgetting to turn off his Instagram live. The gaffe engaged over 2,500 people on social media, listening in and commenting on the broadcast. Earlier, Ruffalo hit the stage to a round of applause at the El Capitan Theatre where the actor could be seen pointing his phone at the audience to capture the moment. But as it turned out, he put his phone in his pocket while Instagram was still live after he teased the fans at the event.