I used to say "I don't know" a whole lot too. When I used to work retail at the register, everytime after I'm done with a customer and they'd say something to me before they leave I'd say "you too" no matter what it was they actually said. hehe Trained condition I suppose. Now I seem to say "**** ****" especially when I get frustrated with a game. Another thing I say regularly is "chicken butt" for no reason whatsoever.