Here's a new development on this little annoyance...
My fiancee and I were returning from the store, and turned down our street with a car in front of us. I recognized the car as possibly one of the many that uses our driveway to 3-point it. So it wasn't much of a shock that this car then turns...into our driveway...
Since we were also trying to turn into our driveway (what a concept) we were effectively blocking her in. So there we are in an automotive deadlock. I rolled down my window and asked what she was doing, and she replies in a really bitchy tone "I'm trying to turn around." I say back with the same tone "I'm trying to turn into my driveway." To which she says... "So?"
I had a feeling we would end up in this situation sooner or later, but I was foolishly expecting the perpetrator to have some class and at least apologize.
Time to build a moat with a draw bridge. When we're looking for someone to fill the position of bridge troll I know just where to look.