Don't forget the Maxwell Smart windscreen washer fluid to the car behind trick. When they're close enough and there is wind, they will receive it too.
One time a bully in a Landcruiser sat on my tail as we were diving into the Sydney Harbour Tunnel. I gave him a light show and put the flashers on and activated my reverse lamps a few times (before the gearbox could get into reverse for rea!). Man did this get a reaction. He swung around my left and stuck his head out blurting unintelligible obscenities before speeding off ahead of me well over the 80km/h limit I was sitting on. He didn't seem to realise that you are not required to move left in an 80km/h or under zone, unless there are signs saying so.
