On Aug. 15, I had the honor of hosting a Q&A following a sold-out, star-studded screening of Tyler Measom and Craig A. Williams’s If These Walls Could Rock, a new documentary about infamous Hollywood hideaway the Sunset Marquis hotel. The directors and I were joined by surprise guest Mark Rosenthal (the hotel’s president and son of Marquis founder George Rosenthal) and special guest Sharon Osbourne. The Osbournes were frequent guests at the Sunset Marquis (the only Los Angeles hotel that wouldn’t kick out Ozzy Osbourne), and the rock ‘n’ roll family used to set up camp at this home-away-from-home for months at a time. Sharon and her daughter Kelly (who confesses in the film that she had her first drink, first kiss, and first line of cocaine at the Marquis) were two of the first celebrities who agreed to appear in If These Walls Could Rock, before Morrissey, Dave Grohl, Bruce Springsteen, Heart’s Nancy Wilson, Michael Des Barres, and many other rock A-listers eventually signed on.

Surprisingly, Sharon had not yet seen the film, experiencing it for the first time along with everyone else in Hollywood’s Landmark Sunset Theater, and she was visibly moved after the screening as she gushed about the importance of preserving old Hollywood and its struggling entertainment industry. And she, along with Mark Rosenthal, shared some sweet family memories of the hotel. But of course, Sharon Osbourne being Sharon Osbourne, she also blurted some wild remarks, one of which expectedly went viral before at least one of the attending iPhone-wielding fans had even exited the theater.

Watch the full, fan-shot Q&A in the video player above, and the offical movie trailer below. If These Walls Could Rock is now available to stream on Apple and Amazon.