Foo Fighters frontman Dave Grohl had a very special guest backstage during the Foos December 4th show at Park MGM’s Dolby Live theater in Las Vegas. Dave Grohl called attention to a fan who looked a bit like KISS bassist/vocalist Gene Simmons, Dave then turned and motioned to the real Simmons who was hanging out stage right. Asking Simmons to just, “Show them your punum.” Simmons, whose face was covered by a mask strode out into view waving to the crowd. The legendary rock god then handed Grohl a bill of indeterminate denomination. Grohl looked at the bill and quickly shoved it into his back pocket before turning his attention back to the audience.

As Simmons walked off, Grohl told the crowd,

“All right. We’ve got a rock show now… Listen, Gene Simmons — legendary bass player. I had posters of that motherfucker on my wall when I was a kid. Hold on, let me rephrase that — I still have posters of Gene Simmons on my fucking wall at home.”

Simmons is a known fan of the Foo Fighters. He Tweeted about his experience saying,

“Backstage with the ⁦@foofighters right before they royally rocked the house last night in Vegas. Fun stuff. And, I can’t say enough about their commitment and authenticity to the fans. Inspiring!”

Earlier this week, Grohl and producer Greg Kurstin wrapped up the eight-part second year of their “Hanukkah Sessions” series with a rendition of KISS’s “Rock And Roll All Nite”. For the accompanying video, Grohl and Kurstin painted their faces in full KISS makeup.