Examples:

• I understand it's a bolt out of the blue, sir.
• And then yesterday out of the blue, he called.
• When suddenly, out of the blue, we find a treasure!
• Well, five years ago, out of the blue, she came into my office.
• The first time we met, he'd called me out of the blue.
• Tequila Esperanto is also 100% out of the blue Weberagave.
• They bought me a wife, like out of the blue.
• And then suddenly, out of the blue, he has another son.
• The military coup in Honduras didn't come out of the blue.
• None of these developments has occurred out of the blue.