Little Freddy goes for a weekend to his uncle John who lives on a farm.
One day Freddy goes for a walk. After about an hour. Freddy comes running back shouting "Uncle John, Uncle John. The bull is fucking the cow".
His uncle John Takes him to one side and said "You should have said. The bull is surprising the cow. And not that filth you've picked up in the playground".
A Few days later, uncle John and his wife are entertaining some guests, when little Freddy runs up shouting. "Uncle John, Uncle John. "The bull is surprising the cows!"
The adults share a knowing grin. And uncle John said, "Thank you Freddy, but don't you mean, cow and not cows, a bull can only surprise one cow at a time".
"No
said Freddy. I mean cows. HE'S FUCKING THE HORSE".