I took a weekend trip to LA to visit some friends, and before leaving I had to try out Mulholland. As I approached the point where everyone always looses it I saw all the oncoming cars wave at me to slow down. I figured there was a cop ahead and backed off a bit (I was already going slow, because a) I was in a company car, b) said company car is the most powerful thing I've ever driven so I wasn't going to push it too hard). As I came around the bend, what I saw was not a cop at all but this.
Not going to say how it happened because frankly I don't know and the more I think about it the more unlikely the story people were saying was.