The singer took to Gallagher Square outside Petco Park to promote the group's upcoming coming-of-age rock comedy Nimrods.
Billie Joe Armstrong of Green Day surprises fans to promote their new film "Nimrods" held at Petco Park on July 24, 2026 in San Diego, California.
Gilbert Flores/Variety
Green Day singer Billie Joe Armstrong gave fans the surprise of their lives on Friday (July 24) when the veteran pop-punk band’s leader jumped on top of an ice cream truck to play a surprise mini-set to promote the group’s upcoming coming-of-age rock road trip comedy Nimrods. Armstrong performed their Grammy-nominated 1994 single “Basket Case” in Gallagher Square outside Petco Park in San Diego, strumming an acoustic guitar while perched on the roof of a Mister Freezie’s ice cream truck, according to videos posted by fans.
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