One of the Ghost's Nameless Ghouls revealed that Foo Fighters frontman Dave Grohl actually joined the Swedish six-piece onstage during one of the band's performances.
While chatting with Jack Osbourne of Fuse TV, the Ghoul was asked on whether Grohl has ever performed with the group wearing a mask. "As a matter of fact, he has," the musician replied, without wanting to reveal any specific details. "But underneath that cloak, it was Dave Grohl," he stressed.
Ghoul also discussed the satanic aspect of Ghost shows, saying that the fans are "very willing to pretend that they are [into Satan] for an hour and a half. And that's the point. At the end of the day, we're an entertainment group."
While on the subject of religion, the mysterious musician also addressed the opposition of religious organizations against the band, calling them smart enough not to be too crass in their approach.
"I think that a lot of Christian society nowadays - they know better than to publicly yell out that 'this band is dangerous,' because they know that will just gather more people to be interested in it."
As far as Dave Grohl is considered, the group previously collaborated with Foo Fighters singer/guitarist on an ABBA cover earlier this year.
The latest Ghost studio effort, "Infestissumam," dropped back in April via Loma Vista as the group's sophomore release. With 14,000 units shipped in the US within the first week, it landed at No. 28 on the Billboard 200 chart.