Each time the lights would go out, the place would erupt in cheers.
The nun walked up to the bartender and asked, “may I please use the restroom?”
The bartender replied, “OK, but I must 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 to the restroom.
While the nun was in the bathroom the place erupted in cheers louder than normal, but the nun thought nothing of it.
When the nun exited the restroom, the bartender said, “didn’t expect that!” and clapped the nun on the back.
The nun asked, “what do you mean?” with a puzzled look on her face as the bartender offered her a drink.
“Well,” the bartender replied, “the lights only blink when someone checks behind the fig leaf!”
P.S. I am on mobile so please forgive me for bad English.