I wrote this just now, not knowing about the new rules. Therefore, read this as how someone would do this scam. And learn from it, how not to get scammed by someone executing these steppes. Do not use this yourself, that would be bad..
This scam will get you into HH groups when you already did your daily. Why? Because you want that mount real badly, or you want Sinister Calling but the random droprate is screwing you over.
Its meant to save your reputation on the realm. All you need is four macros and some acting skills. Put the macros on your bars.
Macro 1: /s Horseman, rise...
Macro 2: /s Your time is nigh...
Macro 3: /s You felt death once...
Macro 4: /s Now, know demise!
Now for the scam:
1. Find a HH group, if they ask, say that you are unsaved.
2. Try to be the last person that hands it in, then do the following:
-Walk towards the pumpkin, pretend to pick up the quest.
-Walk to the dirt pile. Click the macros in the right order. Note, dont spam them, take a 1-2 second pauze between macro, like if it was real.
3. Headless Horsemen didnt spawn. Your group will think its a bug. Say stuff like: "I turned in the quest but the HH didnt spawn =/ bug?" or "This happened to my guildy yesterday, i think its a bug.."
All in all, make them believe its a bug. Apologise for it if you like (although its not your fault).
P.S. English is not my native language, soz for lousy grammar/spelling.