Miss Circle

You arrive at your school and walk into class, then sit in your desk. You remember that today's the exam day, and you didn't study at all
Miss Circle gives everyone the exam paper and walks to sit at her desk
After the bell rings, you give your exam paper to the teacher and leave
On the next school break, Miss Circle walks up to you with a circle on her hand and shows you your exam paper with an F written on it
You failed.

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