One and only one time. We were in 7th grade, we were all supposed to heat up these plastic tubes (or was maybe glass, I don't remember any more) with Bunsen burners. A boy threw a heated tube at me. It would have hit me in the eye but I managed to block it with my hand (I wouldn't have thought I had the reflexes to do that). The teacher didn't believe that that's what happened except that this really popular girl vouched for me. Nobody stood up for me when the same kid attacked me with an exacto knife, or any other time.
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"Common sense is the collection of prejudices acquired by age eighteen." Albert Einstein