You are such a jinx/doomsayer.
给你两个例子感受一下：）
1.In the 1980 s,doomsayers had predicted that the fax machine would push the profession into oblivion.
在上世纪八十年代,一些乌鸦嘴曾宣称传真机将会使得这个职业被人遗忘.
2.Spain and Brazil were pre-tournament favorites.But they could be hit by so-called "Pele's jinx" as the football legend predicted possible glory for the two teams.
西班牙和巴西是赛前夺冠大热,但足坛传奇人物（贝利）已经预言两队有望夺冠,他们也许会栽在这张“贝利乌鸦嘴”上.