Brass Against apologized to fans on Friday after front woman Sophia Urista was filmed appearing to urinate on a fan's face during a Daytona Beach, Florida, set.

The band, known for its brass versions of rock songs, was performing a cover of "Wake Up" by Rage Against the Machine when the incident occurred.

Urista invited a fan up on stage and instructed him to lie down on his back. The singer then proceeded to pull down her pants and appeared to shockingly urinate on his face while performing mid-song.

You can watch a clip of the incident here. (Viewer discretion advised)

Fans who attended the Welcome to Rockville festival in Daytona Beach reportedly called Urista's outlandish moment "disgusting."

"We had a great time last night at Welcome to Rockville. Sophia got carried away. That's not something the rest of us expected, and it's not something you'll see again at our shows. Thanks for bringing it last night, Daytona," the band wrote on Twitter, assuring fans that it wasn't a planned stunt.

According to The Independent, Urista could be heard telling the crowd before the incident that she needed to urinate. During the performance, Urista grabbed a bottle of water, and noted that the show would be closed out with her relieving herself on someone in the audience once she drank it all, The Wrap reported.

"Get my man with the can on his head ready, 'cause we're going to bring him onstage and I'ma p*ss in this motherf*cker's mouth," she said.

"I gotta pee," Urista reportedly added. "And I can't make it to the bathroom. So we might as well make a show out of it."

A few minutes later, he climbed onto the stage, with an apparently empty can attached to his forehead. He laid down flat on his back on stage, prompting Urista to straddle his head, slide her pants down, and aim to pee into the can.

When she finished, the man scooped some of the liquid on stage and threw it out over the audience. After her pants were pulled up, Urista walked back over to him, telling him to get off the stage and calling for security to help her out. "Security, get him the f*ck out of here!" she said. "Get the f— out of here, you're done!"