The bill
A visiting Emperor was in Restaurateur Nasrudin's town, and ate a meal of sheep meat in his restaurant. When the Emperor finished the meal, he asked Nasrudin how much to pay.
"Fifty dollars," Nasrudin confidently responded.
Surprised to hear such a high figure, the Emperor said, "Wow, that is very expensive. Are sheep rare in this part of town?"
"No, not really," Nasrudin replied. "What's really rare around here is visits of Emperors!"
 Compiled from the internet