During a Dead Kennedys concert at Belly Up Tavern in Solana Beach, Calif. this past Thursday (Jan. 15), concertgoers witnessed something a bit out of the ordinary.

Fans saw a couple perform a sex act onstage as the Kennedys performed, with a woman exposing herself to the audience. Reportedly, onlookers took pictures before returning their attention the Kennedys.

According to one person in attendance -- who only offered his first name, Chris -- it was certainly an “oddity.” He told ABC 10 News he’s never seen anything like this before at a concert, continuing, “Especially not at punk concerts. [At] punk concerts, it’s pretty much yelling and screaming at the establishment. This was something definitely different to see at a punk concert.” Watch ABC 10’s full report -- including a very NSFW photo -- in the video above.

While Chris said he did not see anyone stopped by security, a Belly Up Tavern spokesperson said the couple was thrown out of the concert.

According to the local sheriff’s department, exposing oneself in public is only a misdemeanor if others are “offended or annoyed,” and there haven’t been any official complaints from the incident.