My dad frequently repeats this joke us, most of the time unintentionally, but I always laugh at the end.

'A man goes on a business trip to Spain and tired from his day's work, he decides to visit a restaurant that backs on to a bull-fighting stadium.

When given the menu, he can't actually understand what's printed there. Instead, he calls the waiter over and asks for the chef's specialty.

After a while of waiting, the waiter returns with a plate and places it in front of the man. On the plate were two large balls of meat, so he tucks in and finishes both of them.

Once he had finished, he called the waiter over and asked for the name of the dish.
"Bolas de Toros," the waiter told him. "You see, when a bull does in the stadium behind us, they give the body to us to cook and eat. These, that you've just eaten, were the testicles."

The man isn't actually bothered by this because he really enjoyed the taste and texture of them, so he went back to the restaurant every day for the rest of the week that he was in Spain.

On the last day however, he finds himself slightly disappointed as when he asked for his usual meal of two large bull testicles, this time, they were much, much smaller than usual.

He calls the waiter over and says, "What's going on? Why are they so small this time when they were always so big before?"

The waiter replies, "Sorry sir, but the bull doesn't always win." '