I have been married to the same woman for 46 3/4 years. From Day 1 I have tried to teach her to drive smoothly and to look ahead. There have been hundreds of such "discussions". To this day she will, for example, be on the highway, see a truck or car far ahead in her lane going slower than she is, but instead of moving a lane over and not having to slow down, she'll come right up to that person's tail, then hammer the brakes and then abruptly yank on the wheel to change lanes. Every stop the passenger is thrown against the seatbelt. every turn is sudden. In fact, after all those 46 years, I will only let her drive me in the direst of emergencies. When we drove to Florida in February, I drove 2o of the 26 hours we were on the road.
It's not that I don't know how to teach. I was a licensed driving instructor for 10 years; i taught skid control and emergency maneuvers, and I taught all 3 of my boys to drive. But after all this time she still has not got the vaguest clue about smoothness or anticipation.
She doesn't slam the door, though.