Valentine's/Dungeon Queing.
I get that que times can be obnoxious which is why I tank on as many toons as I can for the Valentine's Dungeon despite it only being my OS, but seriously if u come in qued as heals on a shadow priest and then tell me "Hey Im a shadow priest so make sure you selfheal and use cooldowns as much as possible" Im gonna get a lil irritated....if you cant do the job, dont que for it! end of rant