Two nuns are ordered to paint a room in the convent, and the last instruction of the Mother Superior is that they must not get even a 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 undressed.
In the middle of the project, there comes a knock at the door.
“Who is it?”, calls out one of the nuns.
“Blind man,” replies a male voice from the other side of the door.
The two nuns look at each other, shrug, and deciding that no harm can come from letting a blind man into the room, they open the door.
“Nice melons, sister,” says the man, “Where do you want these blinds?”