Little Tommy is at the zoo on a school visit...

Little Tommy is at the zoo on a school visit and he spots a deer. Being a city kid he's never seen one before and so he asks his teacher, "What's that, Miss?"Miss decides to play a word game with him and says, "That's what your Daddy calls Mummy, Tommy."Tommy thinks for a moment and then says, "I'm not stupid Miss, I know that ain't a fucking pig!"