Die Musterknaben (1997)

Anticipating a major drug deal the Düsseldorf LKA (state police) conducts an observation of a flat in Cologne. The night shift in the camera-equipped camper is assigned to local police losers Docker and Dretzke. Taking breaks from the boring job Docker starts flirting with bartender Wanda and all too soon he boasts about their investigations. Conceivably, Docker and Dretzke are stunned when they hear Wanda's voice through the wiretap, as she confides the story of the funny policeman to the answering machine in the surveilled apartment. When the buddies decide to break into the flat to erase Wanda's message, they discover something that sheds a different light on the whole affair.