Once saw a guy on the M3, in a Vauxhall, getting irritated so much that he accelerated hard and braked immediately. All the tailights on the car in front disintegrated, he went straight to the inside lane, the Vauxhall was gone!!

I always sit behind them with the full beam on.

I'm thinking of getting a PA fitted so I can say with a stupid accent, "out of all the lanes on the motorway THIS is definitely my favourite. Now I can cause as much congestion as I want and ....... everyone off".
Then read out their number plate and hopefully shame them.

Alternatively, over take them and pull in front of them and go 10mph slower, and when they try and overtake you, just speed up and don't let them.

The make my blood boil................

Liking that Jay. How about flashing blue lights hidden in the grill