Old one but still funny
A man travels to Spain and goes to a restaurant near the bull arena for a late dinner. He orders the house special and he is brought a plate with potatoes, corn, and two large meaty objects. "What's this?" he asks?
"The Matador Special, Senor," the waiter replies.
"What meat is it?" the man asks.
"Cojones," the waiter explains, "They, are the testicles of the bull who lost at the arena this afternoon."
At first the man is disgusted; but being the adventurous type, he decides to try this local delicacy. To his amazement, it is quite delicious. In fact, it is so good that he decides to come back again the next night and order it again. This time, the waiter brings out the plate, but the meaty objects are much smaller.
"What's this?" he asks the waiter.
"The Matador Special, senor," the waiter replies.
"No, no," the man objects, "I had the Matador Special yesterday and it was much bigger than this."
"Senor," the waiter explains, "the bull does not always lose."