Bombing the auction house which was much like the tainted blood incident was common. Find it on youtube.
This was the base for the mage ability.
Living Bomb — an effect that cannot be dispelled (It will be negated by Ice Block, Cloak of Shadows and Divine Shield, however). The bomb will explode in 10 seconds and cause 3200 damage to the target and those players in the immediate area (it can crit for 4800!). The target of the living bomb will also be flung straight up into the air and take falling damage upon landing. The Damage dealt by this is increased by the amount of +dmg gear a character has on.
Also the old rested system used to penalize you for being "exhausted" as spoken of in latest wow-mag.
Entangling roots used to require druids to be outside making this one semi-cc useless in instances.
There used to be only shaman trainers for Alliance in Exodar making shammy leveling past 20 a huge pain. Solved by adding trainer to SW.
Recently hunters could tame a worgen. I personally had mine taken but others kept them.
Melee used to be able to hit Onyxia while she flew.