The place was hopping with music and loud conversation and every once in a while, the lights would go out. Each time this happened, the place would erupt into cheers.
A nun walked into the bar. And, when the patrons saw the nun, the room went dead silent.
She walked up to the bartender, and asked,

“May I please use the restroom?”
The bartender replied,

“Sure, but I should warn you that there is a statue of a naked man in there wearing only a fig leaf.”

“Well, in that case, I’ll just look the other way,” said the nun.

So the bartender showed the nun way to the restroom.

After a few minutes, the lights went out again and the nun came back out as the whole place stopped to give the nun a loud, enthusiastic round of applause.
She went to the bartender and said,

“Sir, I don’t understand. Why did they applaud me just because I went to the restroom?”

“Well, now they know you’re one of us,” said the bartender. “Would you like a drink?”

“No thank you, but, I still don’t understand,” said the puzzled nun.

“You know,” laughed the bartender, “every time someone lifts the fig leaf on that statue, the lights go out.”