This was a first in 23 years of teaching

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Today I was teaching the bio students about dihybrid crosses (genetics) and how to do the big 16-box Punnett squares. It is easiest to actually just draw everything out on the whiteboard rather than trying to describe it all via diagrams in a powerpoint presentation. My 7th period class can be easily distracted and chatty but generally well mannered. (unlike my 2nd period class) Anyway I was up at the board drawing the ginormous Punnett square for a dihybrid cross. My back was to the students for a couple of minutes because I was filling in all of the boxes. All of a sudden one of the little *#(%*&* whipped a pencil at my head. Their aim sucks because they missed and it hit the board next to my head and bounced off. NEVER in my 23 years of teaching has a student thrown something at me like that. I don't know who did it but I do know what side of the room it came from. I was hoping that a student would stay after class or email me to tell me who did it but I'm not expecting that because like the #1 teenager motto is "snitches get stitches". So at this point there is nothing I can do about it other than never turning my back on them again. Fine with me. Going forward I'll just use the slides which aren't as effective as them seeing me do the problems in real time. Good job guys!