Two nuns are sent to paint an elderly persons flat. They forget to take any overalls so when they start work they decide to strip off to keep their habits clean. After a while there's a knock on the door.
"Who is it?"
The nuns talk it over and decide to open the door as they don't want to keep a vulnerable blind man waiting.
They go to the door as naked as the day they were born and throw it open.
"Where do you want me to fit the blinds...."