One evening, as Uncle John and his wife are entertaining guests with cocktails, they are interrupted by an out-of-breath Freddie who shouts out,
"Uncle John! Come quick! The bull is fucking the cow!" Uncle John, highly embarrassed, takes young Freddie aside and explains that a certain decorum is required.
"You should have said, "The bull is surprising the cow" - not some filth you picked up in the City," he says.

A few days later, Freddie comes in again as his uncle and aunt are entertaining.
"Uncle John! The bull is surprising the cows!"

The adults share a knowing grin. Uncle John says, "Thank you Freddie, but surely you meant to say the cow, not *cows*. A bull cannot 'surprise' more than one cow at a time you know...".

"Yes he can!" replies his obstinate nephew, "He's fucking the horse!"