Storm Diver's Additions Mod/Rubber Duck

The Rubber Duck is an item dropped rarely from ducks, or can be purchased from the Merchant for once the Eye of Cthulhu is defeated. On use it plays the Easter egg "quack" sound effect, with the pitch determined on how far the cursor is away from the player.

Trivia

 * Like the Whoopie Cushion, this item is purely for comedic effect.