I have a great Idea. I'm going pretend I ordered 2 pounds of high-grade Mexican heroin under my roommate's name.
Why would you do that to your friend?
He's always complaining about how bad I am so I want to get back at him.
Wanting to get back at him because you're upset is not a good idea and this is a really serious thing to make a joke about. Joking about drugs can get either you or him in serious trouble if anyone takes it seriously so I would suggest that you not take that risk. That is not something to be joking about at all.
No really, I'm serious.
I know that you are serious, but you should still not do it. If you have a problem with your roommate, speak to him amicably. Ordering heroin is illegal and you both could go to jail for this.