I’ve experience two separate occasions in which drivers were behaving rather poorly when I decided to take out my cell phone, wave it about the cabin so that they could clearly see the device, then place that device to my ear.
It’s amazing to witness the transformation these drivers go through from being unglued maniacs to little angelic beings. As we can see by the video, not all drivers concern themselves with being recorded.
For them there is another tool with a flash to settle them down.