In a lighthearted move, the frontman of Foo Fighters, Dave Grohl, welcomed an unexpected guest, Michael Bublé, to the stage during the band’s headlining performance at Outside Lands at Golden Gate Park in San Francisco on Saturday.

As a creative introduction to their new live drummer, Josh Freese, Foo Fighters embarked on a captivating musical journey, showcasing Freese’s versatile portfolio. This encompassed hits from prominent bands like Devo, Nine Inch Nails, Beastie Boys, and even a delightful inclusion of Bublé’s discography.

With the trademark humor that fans have grown to love on full display, Grohl candidly admitted his unfamiliarity with the lyrics of Bublé’s chart-topping track, “Haven’t Met You Yet,” he then invited audience members who claimed to be familiar with the song to join the band on stage.

Amidst this interactive performance, a self-professed “super fan” captured Grohl’s attention with a sign that unabashedly declared, “I <3 Bublé.” To the astonishment and delight of the audience, this super fan was none other than Bublé himself. Grohl playfully quipped, “This individual had better be well-versed in the song,” before unveiling the surprise guest’s identity.

Subsequently, Grohl shared the lighthearted backstory that led to this spirited interaction, shedding light on the band’s tradition of involving fans in the performance and the delightful challenges it can entail. He expressed his genuine amazement at Bublé’s commitment, affirming, “This remarkable individual — and I assure you, I’m entirely sincere — flew in all the way from Argentina today to serenade you with that song. Because, my friends, there’s simply no limit to how far one can stretch a joke.”

This impromptu collaboration injected an indelible moment into Foo Fighters’ already vibrant and captivating performance. The band’s unparalleled engagement with their audience has evolved into a hallmark of their live shows, and this occasion was no exception.

Watch a clip of Foo Fighters and Bublé’s collaboration below.