Sweet Canadian revenge. It sounds like the thief in this scenario was a real toxic piece of work, in dire need of a wakeup call. Well, he met his match in the roommate that he decided to steal from. Guy kept a calm, cool, and collected head as he went about strategically dismantling the thief's life.
If this Canadian revenge got you going, check out the time that a Canadian took revenge on their neighbor with a frozen trash can.