The teacher was discussing different jobs held by the parents of the students. When she called on Little Johnny, she asked, "And what does your father do?"
"Oh, he's a magician," replied Johnny.
"Really? And what's his best trick?"
"His best trick is sawing people in half."
"Wonderful!" exclaimed the teacher. "Tell me, are there any more children in your family?"
"Yes ma'am, I have a half-brother and two half-sisters."