The summer Farmer John had his nephew visit

A farmer has his brother's youngest son staying with him over the summer. His nephew is from a large city a few states over and has never seen anything of country living. One afternoon, while sharing lunch with some close friends the nephew rushes into the living room where everyone is and exclaims "Uncle Johnathan, there's a cow fucking another cow!" everyone has a good chuckle, even Uncle Johnathan. Later on the farmer pulls his nephew aside and explains

"James, that was a bull, not a cow and that word, the f-word, isn't anything you should be saying at your age, and it's best to avoid saying it at all if you can. If you see something like that again, say 'surprising' instead, I'll get your meaning"

The boy nods and goes on enjoying the countryside and his uncle's farm. Closer to sundown the boy rushes into the living room again and exclaims "Uncle Johnathan, Uncle Johnathan! There's a bull surprising the cows!" the farmer nods and replies "Thank you for telling me Jimmy, but that's a common thing on a farm" the boy incredulously asks "It's common for a bull to fuck a horse?!"