Joke: School Day Morning

I got this joke courtesy from forwaded message in the Instant Messenger. I'll share it here:

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One Early morning a mother went to her sleeping son and woke him up.

MOM : "Wake up, son. It's time to go to school."
SON : "But why, Mama? I don't want to go to school."
MOM : "Give me two reasons why you don't want to go to school."
SON : "One, all the chilldren hate me. Two, all the teachers hate me."
MOM : "Oh! that's not a reason. Come on, you have to go to school."
SON : "Give me two good reasons WHY I *should* go to school?"
MOM : "One, you are fifty two years old and should understand your responsibilities. Two, you are the Principal of the school.