It's a special kind of fun to see. I know I've never seen the one at the lake move that damned fast, which would be pretty cool. Anyhow, it's apparently the second one over there that has done this recently.
To be fair, it's over 10 years old, and I think they were a bit behind on the maintenance for it. I don't really think this is something people need fear of these things.
While reading about this, I was also pointed to this German Wind power company's commercial. It's pretty cute, and in English.