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A joke related to discipline

One day, Xiaoming took a math exam. At that time, the examination room was very quiet, and the blackboard said: Don't talk! Xiao Ming wanted to fart at that time, but the invigilator was very strict. He tried to cover up this fart with a cough. After coughing, a fart came late and the whole class burst into laughter. Only the teacher said: jet lag!