ok first you need to get the Hallows End quest from Spoops in the hut in orgimmar behind the fishing pond, talk to the little girl and she will give you a quest asking you to do her trick or treating, what you have to to is go to the inns at UC,TB, Org and Sen'jin (darkspear trolls) and talk to the innkeepers they will ask you to target them and emote something ex. /train or /flex, anyways once you do that you talk to them and they will give you one of the four pieces of candy. Now if you notice the "?" will still be over their head this is when you can talk to them again and emote again for another piece of candy, but when you go to collect it from them it will say "duplicate item detected" but you can come back and claim the item after you finish the quest. So i completed the quest but i made sure i emoted to the innkeepers twice so i could collect the items after i turned in the quest. It worked so now i have duplicate items that are completly usless because they are "unique quest items". So there ya have it duped hallows end candy that does nothing! I just thought it was interesting and would let ya'll know.
Have Fun
Gandi.