From Team Fortress Wiki
I am a ro-bot! Bloop! What is love?
— The Soldier attempting to understand human emotion
The Idiot Box is a headwear item for the Soldier. It is a crude robot mask made from a cardboard box with team-colored plastic cups taped on for eyes, and a coat hanger stuck to the top. The Soldier looks out of the hole cut for the mouth. It is the same mask that Soldier wears in the Bombinomicon comic.
This item can only be worn around Halloween or during a Full Moon; at other times of the year, it does not appear in gameplay, unless the server has Halloween mode enabled. However, it can be equipped at any time and can still be viewed on the loadout screen even when it is not visible during games.
Enables additional voice responses
Allows the Soldier to perform the Robot Dance taunt
October 27, 2011 Patch (Very Scary Halloween Special)
- The Idiot Box was added to the game.