<human>: This fuck up occurred a few years ago, but it was a fuck up nonetheless. A bit of context, the classmate was a friend of mine and we did stupid shit like this all the time. 

So, it was a slow day in math class, most of the students had finished their work and were all talking and whatnot, waiting until class was over.  Me and my friend were just about finished with our work, mainly because we were talking and not paying attention all class.  He finished first and went to show it to the teacher, while he was away I finished my last exercise and was got up to go to the teacher too. On the way there we both cross paths, him going back to his chair and me going to the teacher.  In this moment a light bulb popped from out of my skull with the magnificent idea of hitting him with my notebook, because why not. 

As I swing my notebook towards him, he raises his arm to shield himself from the blow. My notebook hits his arm, and his arm hits my notebook full force, causing a massive bang and a shock-wave that shook the entire school. What I didn't realize was that my pencil was lodged in my notebook.  The massive blow caused it to go flying off like a bullet and hitting the board in front of the classroom, then ricocheting to a girl's desk. Not a second later I hear the teacher, who also happened to be the school principal, call out my name with the fury of a thousand suns and goes on to ramble about my glorious fuck up, threatening to have me suspended and such.  I got sent to the office where my fate was to be decided, and I was sentenced to 3 weeks of community labor. 
100% worth it.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Hit friend with notebook, he blocked and it caused a huge bang, pencil flew off like a bullet, teacher wasn't so amused.