Police cruisers in Dover, Delaware have continuously running cameras that record what's going on inside. Whoever is driving the car is always on camera. Supervisors regularly review the video footage, sometimes catching officers at embarrassing moments.
For example, here's one officer lip synching Taylor Swift's hit song "Shake It Off." He really gets into it! It's especially funny when he sees someone looking at him, drops into a serious mode, then resumes his in-car dancing the moment he's out of sight.
-via Tastefully Offensive