I had someone in a VW Phaeton try and kill my wife and I on the M6.
We were driving in the outside lane (that's the "fast" one, yes?) at a fair clip, overtaking slower moving traffic that was in the other two lanes. Nothing dangerous, but there wasn't much room to pull in, so we continued along with the Phaeton driver (middle-aged, captain of industry no doubt) right up the backside of the car, gesticulating wildly and flashing his lights.
There was nowhere for us to go without barging into the middle lane, so we continued in this vein until a gap appeared in the traffic. I signalled and moved over, at which point he overtook and slammed his brakes on and swerved across our path.
Had I not been half-expecting a such a wuckfittish maneouvre, we would have been dead. As it was, I had to perform an emergency stop in the middle lane and swerve into the inside lane, causing other cars to also swerve into the hard shoulder etc.
I've seem some god-awful driving in my time - I live in Birmingham - but someone actively trying to kill me was a new one.
I followed him for some distance through the traffic, intending to remonstrate with him at length and possibly with some considerable vehmence - he was getting really worried through the 50mph average speed section, to the point he actually accelerated away over the limit through
the roadworks - another example of his cockishness. Because of the volume of traffic, though, we kept ending up behind him. It was great to see him looking behind him in a panic!
My wife pursuaded me to leave it and report it to the police - who, predictably, couldn't be bothered. Never been in a position where someone actively tried to kill us before though!