Bolt From the Blue

Well, you know how I mentioned out of the blue has a negative form?

Well, ladies and gentlemen, boys and girls, this is it.

Meaning and Etymology
It means, basically, a nasty surprise. The 'bolt' refers to an arrow that you didn't see coming ... and having an arrow fired at you ain't nice.

Meaning
After receiving a nasty shock.

"Whoa. I had no idea that things were so bad between you and Cam that you were divorcing: that's a real bolt from the blue."