[Tim C]

Auto wipers and headlights. I have them on the Navara and thought they would be waste of time.
Now, when I drive the quattro or my wifes car and its dark or raining, I look at the dashboard in a puzzled manner, confused as to why I can't see anything out of the windscreen, and have to try and remember where the switches are.

Oh, and four wheel drive coupled with a turbocharged engine on a road car, they'll probably use it in rallying one day.