You know, threathen him and piss on his pants in the caffeteria and shit on his neck when he sleeps and whatever, and then get all "im sorry dude, ive been childish. you did the right thing, we were doing illegal drugs in your room, and i should not be picking you for obeying the law", and try to hold the laughter. Then, as a peace offering, give him something 'that your mom baked' and make sure he eats it. It will contain cannabis and possibly many other drugs, then make sure he gets fired. Seriously, you must do this for my peace.