Green Day's Billie Joe Armstrong joins London covers band in pub

What do you do when one of your childhood heroes joins you on-stage as you cover one of their songs?

Watch: Green Day play a host of rarities at Lollapalooza warm-up

US music superstar shocks drinkers at a London pub as he plays hit

Billie Joe Armstrong Joins Cover Band on Green Day Song

Green Day's Billie Joe Armstrong Joins Band Onstage at London Bar

Green Day's Billie Joe Armstrong jumps onstage to sing 'Basket

Green Day frontman Billie Joe Armstrong surprises rock band with

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When you walk into a London pub and the cover band starts playing

Billie Joe Armstrong Crashes Cover Band Set in London for 'Basket

Green Day get back to their punk rock roots