So in 7th grade, my best friend and I hated our teacher and wanted to curse her. My friend liked the anime Death Note, so she came up with the idea of cursing her. We looked up rituals online and found one. We had to spill our blood onto a piece of paper, burn it, and then bury it in the ground. Before that, we were supposed to draw a bunch of circles on the paper a bunch of times until it was basically completely covered in black.
So we pricked our fingers with a blade, did the ritual, burned the paper and put it underground, and within that week our teacher sprained her ankle from a broken heel. So we were like OMG it worked. We did a similar ritual again, and then our teacher told us in class that she almost died last night from a gun-shooting. Apparently there was a shooting outside of her house and one of the bullets pierced through her walls
So after that we just stopped trying. I should probably call her and remind her of this but it was so long ago

but yeah I really do believe that these things can happen.