♥ 1K DPS hybrids that decide mid-encounter to heal when the group desperately desperately needs to kill faster, not heal more.
♥ When skull dies last.
♥ Feral druids who stay in bear form or DKs who stay in Frost Presence when they aren't tanking.
♥ Paladins, shamans, and druids who "need" cloth gear.
♥ Yellow recipes that don't give skill-ups.
♥ Ret Paladins.
♥ Gnomes or Draenei with the Deathcharger.
♥ People in their upper 70s that haven't replaced their Kara gear because purple > all.
♥ All the fights in instances that seem to occur on stairs. Sometimes you can get LoS; other times you can't.
♥ Inner Fire.
♥ A week-long cooldown on Northrend Alchemy Research.
♥ Sons of Hodir faction grind.