The Nuns And The Blindman
Two nuns are ordered to paint a room in the convent, and the last instruction from the Mother Superior is that they must not get one drop of paint on their habits. After conferring about this for a while, the two nuns decide to lock the door of the room, strip off their habits, and paint in the nude.
In the middle of the project, there comes
a knock at the door. "Who is it?" calls one of the nuns. "Blind
man," replies a voice from the other side of the door.