Elizabeth was sent to detention for putting on makeup in class, and has just been busted by the principal for putting on more makeup in detention.
Principal: Elizabeth, you know it's against the rules to wear makeup during school hours!
Elizabeth: But sir, it's after school hours now, isn't it?
Principal: It's still against the rules to wear makeup in school.
Elizabeth: Oh, dear. Well, I don't want to break any more rules. I guess I'd better leave right away.
Principal: I guess you'd better. And let this be a lesson to you, never to wear makeup in school again.
Elizabeth: All right, I won't. [She leaves]
Principal: [Suddenly realizing he's been tricked] ...Wait a minute!... Just once, why can't I win just once?!

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