One of the head monks is taking a new novice around the monastery on a little tour. They come to a small room behind the sleeping cells where there is a large wooden box in the middle of the floor. The monk opens the hatch on the box and there is a beautiful ass there. He then tells the novice, "You can come in here anytime you like, except tuesdays, and fuck this ass." To which the excited novice replies, "Wow, what a great looking ass! And I can really fuck it whenever I want?" The monk then affirms, "Yes, anytime you want, except tuesdays." The novice then asks, "Why not on tuesdays?" The monk replies, "Tuesday is your turn."