A tourist goes into a restaurant in Madrid and sees a dish called 'cajones' on the menu. The man asks the waiter what a 'cojone' is, to which the waiter replies that they are the testicles of a fighting bull that has died in the arena.
The man looks a bit squeamish at this news, but decides to give them a try. he orders them and finds that they taste really good.
Next day he returns to the restaurant and, again, orders cajones. However, when they arrive he find the cajones are the size of small walnuts, not the huge juicy testicles he had yesterday. Nevertheless, he tucks in.
Afterwards, he mentions the smaller size to the waiter and asks him what sort of bull had these?
"The bull didn't have those," replied the waiter. "The bull doesn't always lose."