A small boy is wandering in a hotel, and hearing some noises decides to open a door. He says "Wow, it's dark here!"
You can imagine that there's a man with a woman in bed in that room... The man asks, "What do you want? Here's a pound, leave us alone."
A bit latter, the boy goes back again, opens the door, and says: "Wow, it's dark here!"
"Not you again! Here, take this and go buy yourself something." And the boy goes out with 2 pounds.
The following morning, the boy feels some remorse, and tells what happened to his mother. She says: "That's wrong. You should go to the church, and confess yourself."
So there he goes. Entering the booth, he says: "Wow, it's dark here!"
To which the priest says: "Not you again, are you following me around?"