have you ever spelled a curse to someone?

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I know that it was something strange and not so familiar, but I want to know that sometimes when you were very angry you said something bad. And unfortunately it becomes a curse that really happened, as if you spelled a curse to someone. I did it before, when I really angry to someone, I said to him that his life would be miserable and he would never passed the 4th semester on the major he was taking until I got my revenge paid. And it happened, that this guy always failed in the 4th semester subject for 2 years and almost dropped out from the university. I didn't know if it was just an accident or it is because of my words. But it happens not only once. Have you ever feel the same? Or done the same thing? Or you have experienced the same thing, maybe from the one who spelled a curse or the one who got cursed?