Two nuns are in the bath "saving water" when there's a knock at the door.
"who's there?" calls one of the nuns.
"blind man" comes the answer.
"well" says one of the nuns "if he's blind I suppose it'll be alright for him to come in"
"come in" she calls.
Feller walks in:
"mornin ladies, nice tits, now where do you want these blinds?"