The first grade class gathered around the teacher for a game of "Guess the Animal". The first picture the teacher held up was of a cat. "Okay, boys and girls," she said brightly, "can anyone tell me what this is?"
"I know, I know, it's a cat!" yelled a little boy.
"Very good, Eddie. Now, who knows what this animal is called?"
"That's a dog!" piped up the same little boy.
"Right, again. And what about this animal?" she asked, holding up a picture of a deer.
Silence fell over the class. After a minute or two, the teacher said, "I'll give you a hint, children...it's something you're mother calls your father".
"I know, I know," screamed Eddie. It's a horny bastard!"