What I Learned On The Trip

Source unknown. You'll see why.

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My wife is a primary school teacher, and related this tale after another class returned from a trip to a working farm.
My wife asked little David if he had enjoyed the trip.
"Yes it was great - we saw sheep, horses, goats, and fu*kers."
Wife: "Er, fine, fine. I know what the sheep and the rest are, but what is a fu*ker?"
David: "Oh, they're the animals that give us milk."
Wife: "But who said they were called, er, fu*kers?"
David: "That was our teacher. Well actually she called them "effers," but we all knew what she meant."