Alright, this is a bug on many private servers, some larger ones have noticed and taken the effect out but some may have not.
Steps:
1. Get on a private server, create a char, (make sure it's a "fun" server aka insta level 70, custom epic vendors ect.)
2. Port to the gear room(ect.) and buy "The Decapitator" a one-handed axe here is the thotbott link - Thottbot World of Warcraft: The Decapitator
3. Go to your macro creation menu, *(type /m takes you straight to it)
4. Create a new macro, label it w/e. Then type this:
/use The decapitator
/stopcasting
/use The Decapitator
/stopcasting... repeat that as many times as allowed, NOTE: Make sure you have the '/stopcasting' lines or you will only cast the 'use' once.
5. On MOST not all, private servers the decapitator will fling hurling axes at an oppenent mutiple times, usually a 1 hit kill.
Fun way to mess with people that piss you off, can be used while dueling too use at your own risk.