Metallica drummer Lars Ulrich decided to have a bit of fun by joining Royal Blood onstage for a performance of "Out of the Black" hit track during the band's performance in San Francisco last night (April 15).
And while bassist/vocalist Mike Kerr and Lars were rocking out, drummer Ben Thatcher decided to go crowdsurfing. Everything was captured on film by one of the attending fans, you can check out the footage below.
Lars already demonstrated he's a fan of the band by hanging out with the boys last October when they played also played San Francisco. On that occasion, he took the duo to the renowned house in used in Robin Williams' 1993 comedy "Mrs. Doubtfire."
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