Robot Hat

The Robot Hat is a vanity item equipped on the Social Helmet Slot. It is a rare 1 in 500 drop from Piranhas and Angler Fish.

Trivia

 * This hat appears to be a reference to the hat worn by Quote, the protagonist from the popular indie game Cave Story, as seen here. While the Terraria sprite does resemble the Cave Story sprite, the resemblance is more apparent in official Cave Story artwork, and depictions in the credits of Cave Story.
 * The fact that this hat drops from Piranhas and Angler Fish may be a reference to one of the game's bosses, Ironhead.
 * Being found on only "Surface" chests may also be a reference to Cave Story.

History
Robot Hat Robot Hat Шапка робота