Hallow's End Pumpkin Treat

Source
This item is a quest reward from the following quests:

Pumpkin Treats are sold in stacks of 5 from the following vendors once you complete the Hallow's End Treats for Jesper!/Spoops! quest:
 * in Ironforge
 * in Orgrimmar

Effects
The 4 possible forms when you eat this also have effects other than appearance:


 * 1) Great Pumpkin (”You feel larger… and oranger…") - can proc a chill/ slowing effect Stacks with other transformation buffs
 * 2) Skeletal Giant (”You look a bit thin…") - grants underwater breathing
 * 3) Pirate (”Yeargh…”) (riding a mount is allowed with this costume) - increases swim speed by 50%
 * 4) Ghost (”OoOoOoo…”) - grants levitation (slow fall/water walking); this costume cannot engage in combat

If you receive the Great Pumpkin effect while another effect is active, you will receive both benefits and looks at the same time. This is only confirmed for the Pirate effect currently.