If you wander around in the Dalaran sewers you will sometimes find little green vials sitting on the ground--pick it up and drink the Underbelly Elixir, and it will have a random effect on you. The Hungry Tuskarr buff is the most useful, since it gives the buff to Fishing skill, but there are also a couple other more common buffs (turning everyone into mages, and turning you into a flying purple wasp).
Shadow Council: Jol, Quetsul. Level 85 Troll Hunters.
Moon Guard: Tanakyll, 85 Orc Shaman; Atavah, 85 Troll Hunter.