Green Day's Billie Joe Armstrong brings 10-year-old on stage at SF's Outside Lands

Green Day frontman Billie Joe Armstrong wowed the crowd  

a local punk band brutally released  

the Outside Lands Music Festival in San Francisco on Saturday night.  

This continued to surprise, but because it was a 10-year-old kid.

He shouted at the crowd that filled the entire polo arena  

“There are only three F-King chords.

Armstrong watched the audience carefully.