Oh

Croesus asked the oracle at Delphi whether he should attack the Persians. She replied that if he went to war, he would destroy a great empire.

Croesus attacked, but the Persians beat him back, invaded his kingdom, and threw him into chains. He sent another message to the oracle: “Why did you deceive me?”

She replied that she had not deceived him — he had indeed destroyed a great empire.