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Well, I doubt those kids forgot the lesson thirty years later.

My mom was telling my sister and I a story about how when she was in middle school, her class couldn't grasp that anything divided by 0 is undefined. Eventually, her teacher snapped and, well, let's just say the classroom got a new crown molding.

Mom said she'll always remember how her teacher went and wrote "Unknown Undefined" all around the room in chalk.

Description
Well, I doubt those kids forgot the lesson thirty years later.

My mom was telling my sister and I a story about how when she was in middle school, her class couldn't grasp that anything divided by 0 is undefined. Eventually, her teacher snapped and, well, let's just say the classroom got a new crown molding.

Mom said she'll always remember how her teacher went and wrote "Unknown Undefined" all around the room in chalk.