A beer garden that usually hosts polka bands obviously made a mistake when they decide to spice up their entertainment offerings.

A November 18 concert featuring notorious booty bass group 2 Live Crew was attended by undercover agents from the California Department of Alcohol and Beverage Control. According to The Sonoma Valley Sun, the agents witnessed explicit lyrics, partially nude lap dancing and simulated sex acts.

The owners of Little Switzerland, which advertises itself as a 1920s style European beer hall, may be fined by the agency or suffer a suspension of its alcohol license, according to investigator Scott Warnock.

The 2 Live Crew was not specifically targeted, Warnock confirmed.

A show scheduled in nearby Guerneville for Nov. 20 was canceled after the Little Switzerland incident.

The beer hall's owners, Antonio and Alina Garcia, were unavailable for comment.