Examples:

• The news of her sudden resignation was a bolt from the blue; no one saw it coming.
• Winning the lottery was a bolt from the blue for John, who had never expected such luck.
• The company's decision to close the branch came as a bolt from the blue to the employees.
• His unexpected visit was a bolt from the blue, but a pleasant surprise nonetheless.
• The announcement of their engagement was a bolt from the blue for their friends and family.
• The discovery of the ancient artifact was a bolt from the blue for the archaeologists.
• Her sudden illness struck us like a bolt from the blue; she had been so healthy.
• The CEO's abrupt retirement was a bolt from the blue for the entire organization.
• The unexpected storm was a bolt from the blue, catching the sailors off guard.
• The stock market crash came like a bolt from the blue, affecting many investors.
• When he proposed to her, it was a bolt from the blue, but she happily accepted.
• The verdict of the court was a bolt from the blue, shocking everyone in the courtroom.
• His decision to move abroad was a bolt from the blue; no one expected it.
• The sudden power outage was a bolt from the blue, disrupting the entire neighborhood.
• Her acceptance into the prestigious university was a bolt from the blue, as she hadn't expected it.
• The news of their divorce was a bolt from the blue; they seemed so happy together.
• The offer of a promotion was a bolt from the blue, completely unexpected by her.
• The surprise party was a bolt from the blue, leaving him speechless and delighted.
• The team's victory was a bolt from the blue, considering their poor performance earlier.
• The discovery of a new species was a bolt from the blue for the scientific community.