Boy-Razor
A bullied boy tries to get even with his tormentors by sticking a razorblade through a crack in a waterslide. When he realizes his revenge is out of proportion, he starts a race against time to set things right.
Starring Menasse Kefela, Emanuel Addis, Kewin Engström
Watch "Boy-Razor" on Amazon released in 2015. It's a drama and thriller movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.