And whoever said artistic talent wouldn't come in handy? This guy pulled off a great roommate troll. And all you need is a long sheet of brown paper and the ability to draw squares and rectangles. This prank answers the question of what's behind door number 2. And the answer is absolutely nothing. This only works if the layout of your place is similar to this. Got a roommate who's oblivious or has a habit of stumbling in after a wild night? We bet you can fool them into thinking this other room is theirs. Of course, the feeling of walking into paper may be a giveaway. But hey, if they choose the wrong door, you've already won.