搞錯，空歡喜，進球無效，一場空歡喜，煮熟的鴨子飛了 還沒和牌，看錯了把牌攤開說和了 最後便輸了

to announce good news by mistake, often used while playing majong when a person mistakenly thinks that he/she has won the game but has accidentally mistaken it and lost.