Michael Bublé; Dave Grohl.Photo:Todd Williamson/NBC/NBCU Photo Bank via Getty; Dave Benett/Getty

Todd Williamson/NBC/NBCU Photo Bank via Getty; Dave Benett/Getty
Michael BubléandDave Grohlof theFoo Fightersproved to crowds at Outside Lands just how much they think “there’s no such thing as taking a joke too far!”
On Saturday, a long-running tour gag from the rock band Foo Fighters came to an epic conclusion during their headlining set at the music festival in San Francisco.
At Outside Lands, Bublé, 47, got in on the bit.
So when Grohl went on to ask the audience, “Who knows the f—ing song?” he pointed out a “superfan” holding up an “I heart Bublé” sign and invited him on stage.
“This mother—er better know the song,” Grohl was caught saying in avideo Foo Fighters posted to X(formerly known as Twitter). “Do you know the song? Because people say they know it but they don’t!”
The “superfan” definitely knew it — as it turned out to be the crooner himself! He then belted the hit out once he got on stage, with the crowd joining in on the chorus.
Dave Grohl performs at Bonnaroo in June 2023.Erika Goldring/Getty

Erika Goldring/Getty
Later, Grohl shared with the audience, “For real, we’ve been doing that thing where people from the audience come up and say, ‘I know the f—ing song,’ and they walk up and they’re like, ‘I know the first verse.’ They don’t know it!"
“So this badass motherf—er,” Grohl continued, referring to Bublé, “and I’m not even kidding — flew in today from Argentina to f—ing sing that song to you guys. Because there’s no such thing as taking a joke too far.”
Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
Bublé had even more fun with the joke after the set. The singer-songwritershared a video to Xof him saying, “Well, the time has finally come, I’ve been asked to be in the Foo Fighters.”
“F— you, Bublé!” Grohl responded in the clip.
Foo Fighters have been on tour since May 24, playing their first shows following thedeath of their drummer Taylor Hawkinswho died at age 50 in March 2022.
Just days before the rock legends set out on tour, theyannounced that Freese would be joining themin a special livestream.
The Grammy winners have headlined a handful of festivals this summer, including Boston Calling here theybrought out Hawkins’ son Shane, 17, to play with them on drums.
Their appearances at festivals like Austin City Limits, iHeart Fest, Ohana Fest, and morecontinue throughout the fall.
source: people.com