Toilet Paper
Or rather, people who don't replace the roll if they use the last piece. No idea why it annoys me, but it does.
One of my old housemates learned his lesson because of this peeve - when he found himself without, I posted the sheets under the door to him. One ply at a time. I'd feel worse about it if the other housemates hadn't held the door shut so he had to suffer...
(Sneezy Badger can't wait to quit his job on, Fri 2 May 2008, 22:12, Reply)