armstrong unleashed a cascade of angry f bombs during a live concert over the weekend in vegas, and, yeah, it was all caught on tape. you got to be kidding me. reporter: it started suddenly. give me a break. reporter: green day front man billie joe armstrong goes off out of nowhere diving into a rage-filled tirade. i m not [ bleep ] justin bieber. reporter: smashing the guitar before storming offstage. we ll be back. reporter: shocking the thousands of fans who just moments earlier were rocking out with one of the biggest bands in the world. am i just an reporter: so how did it go from this to this? i got one minute, one minute left. oh, now i got nothing left. reporter: it turns out billie joe s freak-out was a matter of time. you can see a monitor. cue the band. they ve got one minute left. that s what set him off. look at that sign right there.