Armstrong went ballistic when he discovered 20 minutes were getting cut from Green Day's set, reports the Daily Mail.
Armstrong said: "You're going to give me one minute? One f*cking minute? I've been around since f*cking ninteen eighty f*cking eight and you're going to give me one f*cking minute? I'm not f*cking Justin Bieber, you motherf*ckers.'
Armstrong said the f-word word more than 20 times in the minute he had left, before his microphone was turned off, then he smashed up his guitar onstage.
WARNING: GRAPHIC VIDEO