表达 “have the last laugh” 的意思是 “笑到最后，取得最后的胜利”，它用来描述 “当他人认为某人做某事会失败时，此人却获得了成功” 的情况。

例句
Everyone assumed John would come last in the race, but he had the last laugh when he finished first!
所有人都以为约翰会在赛跑中落在最后，但他却第一个完成了比赛，笑到了最后！

I had the last laugh when everyone mocked my old-fashioned shoes. It turned out they were the latest trend.
当大家都嘲笑我过时的鞋子时，我却笑到了最后。事实证明，这双鞋是最新潮流款。

My friends said I was foolish to take an umbrella to the party. However, when we left it was pouring with rain, so I had the last laugh!
朋友们说我带伞去参加聚会太傻了。但当我们离开时，外面下起了倾盆大雨，所以我笑到了最后！