We just bought a new car, and it has headlights that turn to the left or the right when the steering wheel has turned in that direction. It's a pretty neat feature, although I discovered an interesting "attack" you can do with it, even unintentionally. The distance the steering wheel needs to turn to trigger the auto-adjust happens to be the curvature of the onramp from Storrow Drive to 93 North. So if you happen to be behind someone, and the steering wheel has any jitter in it (not that, you know, you'd jitter it intentionally), your headlamps will wash back and forth across the inside of their car.
As if being followed by a tall car wasn't already painful enough.