Twelve Hours

For this recipe you will need a couple things:

A fight; one followed by a punishment. And why not throw in a messed up prank? Add murder while you're at it too.
For the next step, you'll need to add a few screwed up relationships and emotions. That's followed by lies and betrayal. Oh, and add some darkness for some good measure.
With all these ingredients, you have a recipe for chaos. And so chaos shall ensue.
As your oven, just use a school, but be sure to lock all the doors. No one in. No one out.
Bake for Twelve Hours.

Enjoy.