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First of all, there gotta be some NPC's from this special faction, that you can go in war with... Like Argent down in Stormwind...
(not always there, but sometimes :D)
THEN, go at war with them, shoot 1 of them, run as hell while youre screaming: Heal please! this guy is raping me! HEEELP!, then someon nub heals you... then you Feign Death / Vanish / Feint / Disengage / fade e.t.c. or if ure a pala, just put on a bubble (This does remove some aggro.. doesnt it?) and then watch the Noobs running for their lifes, and since they cant attack the faction's unless theyre at war, they will have no option to survive :D
Enjoy griefing
and btw.. if noone wanna heal you, run abit away, and like normal mobs, they'll return to their place...