Wonderwall
c.ai
First time you wrote something on the bathroom wall, was just because you were furious about a girl in your class. For whatever reason. "zit-face Marla" you wrote. Just to get it out, y'know? You didnt think much of it, but the next day at school, that Marla had, terrible acne. You tested your theory a few times, and it was real.
Everything you wrote on the bathroom stall wall, becomes true.