What trash pull do you hate the most?

Every raid has at least one trash pull that makes you want to tear out your hair. For me, the worst two candidates are the zerging trash waves in the Burning Crusade raid version of Mount Hyjal, and the ones just before General Vezax in Ulduar. I hated the Hyjal trash because I had to stand up ahead of the raid and count on Spell Reflect to get the aggro on them, and Ulduar trash I hated for all the ways it could go wrong. Cataclysm had some awful trash pulls, too, like the entrance trash in Bastion of Twilight, which I hated even more than I hate the hallway trash in Emerald Nightmare after the first boss.

You can hate trash pulls for lots of different reasons. You can hate them because they require massive amounts of CC, or because they come in waves and you can’t time your responses well, or because there’s simply a lot of them to deal with. Sometimes trash actually seem to hit harder than a boss, like some of the trash in the Warlords era Hellfire Citadel which felt worse than the bosses, or you can just feel like “oh God, do we have to have a trash pull here I just want to kill the boss already” and not want to have to deal with it. Kind of like the trash before the Chronomantic Anomaly in Nighthold, which just feels like an utter waste of time. Just let us pull the boss already.

So what do you think? What’s your least favorite trash pull and why?