I've seen this in Asia, there's an employee who basically is standing at a raised spot in the corner and if you take out your phone they shoot a small laser pointer right into the camera, it messes with the video. They can't get it on there all the time but a video where half of it (or more they are surprisingly accurate) is a strobing laser becomes pretty garbage anyways. While they are doing that another employee/bouncer comes over and warns them, have seen people get kicked out for pulling it out a second time.