For this to work you will have to have stealth.
-Skill up your engineering so that you can make Explosive Sheeps
-Make a shitload of sheeps
-Go to the alliance or horde starting area(Mulgore, Elwynn Forest etc)
-Now deploy sheep and stealth
-Look for new made toons and follow them
This will result in the low level hitting the sheep and becoming absolute paranoid about sheeps when it blows up in his face and kills him. After you have killed him(or killed himself is more like it) just follow him around making him think the sheep is "out to get him". I have had some amazing fun with this "trick", when you find the right victim(not someone making an alt or a twink, but someone new to the game) you'll laugh your ass off, I promise.
Also what is great fun is making a toon, run it all the way to the respective factions duel area. Now wait for one of the duelers to go to their knees, run over to him and hit him once and you have killed your first level 70, nerf you.
No idea if this was the right part of the forum to post it in(seemed so) or if it's been posted ages ago or whatnot.
Enjoy, I do.