Brain withdrawal

J and I were playing cards recently. At one point in the game he played a card out of turn. Recognizing that I had seen the card which he had to take back, he gave me a look and said, "Now you know what one of my cards is."

I told him I would forget it, to which he responded, "You'll take it out of your brain?"

Chuckling at the mental picture, I answered, "Yep, I'll take it out of my brain."