Green Day singer joins in on cover performance of his own song at London bar

Green Day lead vocalist Billie Joe Armstrong joined the alt-rock band Borderline Toxic in a cover performance of his 1994 hit Basket Case on Saturday, May 13, much to the surprise of the band and patrons at a London bar. Footage recorded at Slim Jim’s Liquor Store in London shows Armstrong sharing the mic with Borderline Toxic lead singer Kerry Glass. Credit: Jon Chappell via Storyful