Wake up son, time to go to school

One morning a mother was trying to wake up her son.

“Wake up now! It’s time to go to school.”
“I don’t want to go to school,” the son replied.

His mother said, “Give me two reasons why you don’t want to go to school.”
“Okay. One, all the children hate me. Two, all the teachers hate me.”

“Not good enough,” the mother replied.

“Fine,” the son said. “Then you give me two good reasons why I SHOULD go to school.”

“One, you’re 50 years old. Two, you’re the principal of the school.”