I've found a bugged item that makes anyone run in fear, even NPCs
The item is Bright Flare - Item - World of Warcraft.
It casts a 10 second fear on anyone, horde, ally, pvp-flagged or not. Too bad it has a 30 second cooldown and very low range(10-15 yds)
I have tested it on AMDWOW, unluckily they removed the quest giver there, so if you find any other server where it works ill update this post