The subject of this article or section is part of Hallow's End, a seasonal event that lasts two weeks. Once the event has run its course, this will no longer be available until next year, but there are no guarantees.
The 4 possible forms when you eat this also have effects other than appearance:
Great Pumpkin (”You feel larger… and oranger…") - can proc a chill/ slowing effect Stacks with other transformation buffs
Skeletal Giant (”You look a bit thin…") - grants underwater breathing
Pirate (”Yeargh…”) (riding a mount is allowed with this costume) - increases swim speed by 50%
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.
Notes
Only the Pirate and Great Pumpkin effects will allow you to mount whil keeping the buff active.
Pre-Hallows End 2007, when you received the Skeletal buff you took the appearance of an skeletal warrior. As of now, you take the form of a normal skeleton.