Definition
Describes a narrative, such as a story or joke, that has a surprising or unpleasant twist that is revealed only at the end.
先苦後甜（結局出人意料）
The movie seemed ordinary, but the ending was surprisingly shocking; it really had a sting in its tail.
這部電影看似普通，但結局卻出人意料地令人震驚；它真的在結尾藏了一手。
The joke started out ordinary, but the last line had a sarcastic twist; it definitely had a sting in its tail.
這個笑話一開始很普通，但最後一句帶有諷刺的轉折；它絕對在結尾藏了一手。
The agreement looked good, but the fine print contained a trap; it had a sting in its tail.
協議看起來不錯，但細則中藏有陷阱；它在結尾藏了一手。