"What is that you just served at the next table?" he asked the waiter.
"Ah, senor, you have excellent taste!," the waiter replied. "Those are bull's testicles from the bull fight this morning. A true delicacy!"
"I'm so sorry, senor," the waiter said. "There is only one serving per day because there is only one bull fight each morning. If you come early tomorrow and place your order, we will be sure to save you this delicacy."
The next morning, the cowboy returned and placed his order. That evening he was served the only special delicacy of the day.
After a few bites, and inspecting the contents of his platter, the cowboy called to the waiter and said, "These are very delicious, but they are much, much smaller than the ones I saw you serve yesterday."
The waiter shrugged his shoulders and replied, "Si, senor. Sometimes the bull she wins."