Little David's mom asked little David if he had enjoyed the field trip. "Yes it was great - we saw sheep, horses, goats, and f*ckers."

Mom: "Er, fine, fine. I know what the sheep and the rest are, but what is a f*cker?"

David: "Oh, they're the animals that give us milk and steaks"

Mom: "But who said they were called, er, f*ckers?"

David: "That was our teacher. Well actually she called them 'effers,' but we all knew what she meant."