It was just a misunderstanding My wife asked little David if he had enjoyed the trip. ""Yes it was great - we saw sheep, horses, goats, and f???ers."" Wife: ""er, fine, fine. I know what the sheep and the rest are, but what is a f???er?"" David: ""Oh, they're the animals that give us milk"" Wife: ""but who said they were called, er, f???ers?"" David: ""that was our teacher. Well actually she called them ""effers,"" but we all knew what she meant.""