What is a Defective Turret? No really. Tell us. We haven't played the game yet. BUT, we do know that the Portal 2 Defective Turret Keychain is the perfect companion to a videogamer's keys. Especially a fan of the Portal game series. Ok fine we lied, we do know what they are and if you play the game, you know they are hilarious. So have this awesome piece of your favorite game with you at all times. The Portal 2 Defective Turret may damaged in the game, but they are totally helpful in real life.