实用口语：throw a curveball

Throw a curveball 出乎意料地做某事

e.g. He threw me a curveball when he suddenly decided to quit his job. 他突然决定辞职，让我措手不及。

e.g. She threw me a curveball by asking me to marry her. 她突然向我求婚，让我措手不及。

e.g. Life is full of curveballs, so you have to be prepared for anything. 生活充满了意外，所以你必须做好任何准备。