If you've ever had a bad roommate, you know that it's a special kind of Hell that you cannot escape. Your home should be your safe haven, not a source of bitter resentment and repressed rage. If you're suffering from a bad roommate, there is a solution. No, I'm not talking about moving (in THIS economy?!). I'm talking about revenge. Petty, beautiful, glorious revenge.
My old college roommate didn't know how to cook or do dishes and didn't go food shopping much. This led to him eating my food, especially my leftovers as those were prepared meals. I would use my leftovers to meal prep for the week, and told him to stop as it was expensive as well as inconvenient. The behavior did not stop and he actually seemed to be eating more of my food out of spite. To punish him, I baked a chocolate cake with habanero peppers and mixed the frosting with wasabi. I labled it with my name and a bold "Do Not Eat" and waited.