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?

Billie Joe Armstrong shocks London drinkers by singing Green Day

Billie Joe Armstrong of Green Day Surprises London Pub With

Billie Joe Armstrong surprises cover band by joining them on stage

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

Green Day's Billie Joe Armstrong Jumps On Stage In London Pub

Green Day frontman Billie Joe Armstrong surprises rock band with

Green Day get back to their punk rock roots

Green Day's Billie Joe Armstrong left disappointed after

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

Watch: Green Day's Billie Joe Armstrong jumps on stage with cover

Cover band stunned as Green Day's Billie Joe Armstrong joins

Watch Billie Joe Armstrong Sing Basket Case With Shocked Green Day

Green Day's Billie Joe Armstrong Jumps On Stage at London Pub for

Green Day's Billie Joe Armstrong Joins Cover Band on Stage for