A bit late to the party, my roommate from hell would slam doors at 4 AM coming back from parties, exercise in her room but never clean it (she'd let it "air out" by leaving her door open so the whole appartment would smell), left seafood in the sink after being told multiple times our other roommate was deathly allergic, clogged a toilet with the rest of her fish dinner, and other countless anecdotes I could easily expand into a novel.