A chicken leg of doom.
The Giant Chicken is typically not in the game. However, on April Fool's Day, Oryx the Mad God is replaced by the Giant Oryx Chicken. During the rest of the year, it cannot be found, making its novelty drops rare.
The Chicken Leg of Doom was the first weapon where the projectile matches with the weapon icon in the inventory, but since April Fool's 2017, Apocalypse Feather also has this property. This creates the illusion of "throwing" the Chicken Leg of Doom, which is amusing for some.
The Chicken Leg of Doom has a slightly higher range than most other daggers, the only dagger to surpass this range is the Carved Golem Remains. This is, however, insignificant due to the fact that this is a vanity weapon.