Uncle John.

One evening, as Uncle John and his wife are entertaining guests with cocktails, they are interrupted by an out-of breath little Johnny who shouts out, "Uncle John! Come quick! The bull is f**king the cow!" Uncle John, highly embarrassed, takes young little Johnny 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, little Johnny comes 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 little Johnny, 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 f**king the horse!"