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You fall out of your chair, the whole class starts laughing. But "Joe" keeps bugging you about it days after it occurred. Joe laughs teases you about it and tells other students. Bullying or Teasing?
What is Bullying? This is bullying because it is an action repeated over and over. It would be teasing if it occurred once in class and was never repeated. (report this behavior immediately...do not empower the bully)