There's so much cool stuff in this thread it could almost exist on the front page

I learned so much about the X from all the links on the front page it's not even funny
Here's something I discovered by accident: If you have adaptive headlights, the only way that they will swivel left and right along with your steering wheel is if you turn the headlight switch to the left, to the Auto setting. If you turn the headlight switch to the right, the headlights remain pointed straight ahead at all times.