The intrigue is over.
Festival-goers are convinced Foo Fighters will be performing on the Pyramid Stage once again, thanks to this clue.
Foo Fighters' lead singer Dave Grohl also invited his daughter Violet Grohl to perform onstage as the band tackled a set at Boston Calling on Friday.
The nearly six-hour tribute concert featured appearances by Paul McCartney, Travis Barker and Dave Chappelle.
The Beatle drew lots of parallels between himself and the former Nirvana drummer when he inducted the Foo Fighters into the Rock & Roll Hall of Fame.
The Foo Fighters star said he has "many ideas" about how to resolve the issue.
Spencer Elden was four months old when he was photographed swimming nude for the grunge group's album artwork.
The Rolling Stones frontman has spoken out after dropping the surprise new single, Eazy Sleazy, with Dave Grohl.
Nandi Bushell, a huge Foo Fighters fan, just had the surprise of her life.
“You win round one… but it ain’t over yet!” the Foo Fighters founder told Nandi Bushell.