The following accident took place in Denmark during a storm on 2/22/08.

Here’s the first view:

Here’s the second:

Yes – that is a truck at the base of the windmill when it self-destructs. I’m not sure if I can see people near the truck in the video or not.

The “cause” of the accident was the failure of the brake that limits the speed of the windmill during a storm. The speed of the blades were approaching the speed of sound when they failed.