The Blind man knocks

 There is a Nun having a bath,

and she hears a knock on the door.  

And she's a bit wary, so she shouts out, 

"Who is it?"  

And he says, 

"it's the blind man".

She said, "well come in". 

And as it comes in he says, 

"Nice tits, where do you want the blinds?"