<human>: Can you condense the text into a few key points?

I'm in high school and have chemistry and English class with one of the most annoying people I have ever met. He is incredibly arrogant and strives to be correct and tell everybody off for not knowing something. Therefore, he has few friends, he sits next to me in Chemistry although his presence doesn't really bother me. He makes a few stupid jokes now and then but I usually put up with him to sit next to my friend on the right.

One day, the asshole in double Chemistry seems to have nothing to do, he isn't paying attention in class and his cringe worthy jokes are dying down. He sees a opportunity to have some fun by pissing me off, I generally just smile and don't give a shit when he talks to me but for some reason he began headbutting my bicep. I didn't do anything to provoke him but I knew he just wanted a reaction.

A brilliant idea came to mind and I simply lifted my arm off the desk before his next headbutt and he smashed his head into my elbow. It made a dull thud and he winced in pain, grasping his head as he realized that he had really brought it upon himself. It felt great to hear that noise...people around me saw and laughed.
<bot>: Purely arrogant asshole begins headbutting my arm to piss me off, I lift it to give him the pain of hitting my elbow and classmates laugh at him.