Everyone can identify the obvious causes of roommate strife. You're a slob. You're a mooch. You invite unsavory characters back to the communal pad.
But many students hate their roommates for stickier, subtler reasons. Some of these reasons are your fault. Some are beyond your control. Either way, knowing why you're hated is half the battle. The other half of the battle involves secretly tampering with their stuff... (I'm just kidding. I don't endorse tampering. Please don't write angry comments, or in any way corrupt your roommate's Captain Crunch.) And feel free to add your own comments on why some roommates can't help hating each other.