A good teacher

One day, a teacher was attempting to teach the names of animals to a class of 5-year-olds. She held up a picture of a deer, and asked one boy, "Billy, what is this animal?". Little Billy looked at the picture with a disheartened look on his face andresponded, "I'm sorry Mrs. Smith, I don't know.". The teacher was not one to give up easily, so she then asked Billy, "Well, Billy, what does your Mommy call your Daddy?" Little Billy's face suddenly brightened up, but then a confused look came over his face, as he asked, "Mrs. Smith, is that really a pig?"!