We were on the M6 in the north yesterday when a woman with young kids in the car (the one in the front seat was far too young to be in the front) indicated for a second and pulled straight into our Lane, millimetres from the front of our car. We had to heavily brake at 70mph in heavy traffic. We were all thrown into our seatbelts in the car.
She was oblivious to us blowing the horn. Didn't seem to think that she had done anything wrong, but then started a stupid game where she would overtake, get the kids to wave at us, then slow down again and did this several times before finally pulling away.
I just don't think that she had a clue just what a stupidly dangerous thing she did. It was so close to being a bad accident that thinking about it kept me awake, while she just didn't give a shit.