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Mark Ruffalo on Tuesday night accidently streamed (audio only) a portion of Thor: Ragnarok from the Los Angeles world premiere when he forgot to turn off his Instagram live.

To introduce the screening, the Bruce Banner/Hulk actor, who stars in the new film, hit the stage to huge applause at the El Capitan Theatre when he and his co-stars were announced by a recording of castmate Jeff Goldblum (in character as the Grand Master). Ruffalo was pointing his phone at the audience to capture the moment, but apparently, he put his phone in his pocket while the social media platform was still running after using it to give fans a closer look at the event.

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