"There are computers in heaven," said the student.
"Oh?" said the teacher, "and what do they do?"
"They compute the universe for God," replied the student.
"Hmm," said the teacher, "and how do you know?"
"Because," said the student, "God told me so."
"And how does God know?" asked the teacher.
"Because He invented them," declared the student.
"Oh?" said the teacher, "and who invented God?"
"Well," said the student, "what other answer could there be?"