The Sisters Of Mercy

A man is driving down the highway when he sees a sign:

SISTERS OF MERCY PROSTITUTION HOUSE - 10 MILES

He seems surprised but drives on.
Further down the road he sees another sign:

SISTERS OF MERCY PROSTITUTION HOUSE - 5 MILES

He seems surprised but continues down the road, looking for signs.
Eventually he comes to a junction where there is another sign:

SISTERS OF MERCY PROSTITUTION HOUSE - NEXT RIGHT

His curiosity gets the better of him. He turns off and comes to a car park. There is a large convent and above the door there is a sign:"Order of the Sisters of Mercy". He knocks on the door. A nun dressed in full habit answers the door.

"What can I do for you young man?" she asks. He tells her that he saw the signs on the highway. "Follow me," she says, and they go inside. They walk up and down stairways and around the entire convent. Eventually they come to a door where the sister knocks.

The mother superior answers and the sister explains the situation to her. The mother superior says to the man, "put $50 in this tin," holding out a tin. He does. She then says, "go down the corridor and through the door". The man rushes down the corridor, and out the door. The door locks behind him.

He then realises he is back in the car park. There is a sign in front of him:

GO IN PEACE - YOU HAVE JUST BEEN SCREWED BY THE SISTERS OF MERCY