Fun/cruel ways to totally RUIN this kid...?

Ok there's this boy in my cl (im 16) who is pissing me of soo bad. He looks like a total nerd like really ugly thick gles huuuge lips we call him fishboy or 'beaver' lamo & f'n stupid clothes gay hair etc when I tried to help him and be nice all I'd get is a sarcastic ''thank you''he'd avoid me I'd ask why then he'd laugh walk away and behind my back call me a stupid ginger *****, a tramp, a horrible smelly ***** and that he wants to 'get rid of me forever' hed look me right in the eye and scream at me to get to cl even if i wast late & onetime b4 cl he was reading a dictionary then i mumbled to myself bored then he turned his head round, looked me riight in the eye and screamed ''if you're GOING to say something YOU SAY IT IN MY FACE, YOU GET THAT?!'' before he ran up to the locker room and said ''Will you just STOP spying on me?!'' (because I was just talking to a friend in the same cafeteria as him for 2mins) and ran out. Hed turn his head round and gaze at me hes got the souless lookin lightblue eyes that are just soo creepy lol. I wasn't even looking at him he ped me in the hallway and said in a monotone voice ''Stop staring at me.'' Hes weird on the bus last november hed be writing nazi swatstikas on his arms and showing it to people. Then when we had to watch a movie this guy walked on screen and he was like 'kill him hahaha'' smiling & frowning at the same time. Then about a month after that I kinda overheard him at lunch talking about strangling (strangled some kid he didn't like idk) he joked about killing a teacher because he didnt like her cles lol hes often miserable even tho hes got a gf whos a total midget lmao. Hell have his head in his arms and sulk most of the day he NEVER SMILES always talks in monotone voice gives me dirty looks and deathstares giggles at me if I ask whats wrong.me & my friend were joking about him becoming a serial killer & being on the news so me and my friends were all joking laughing about it at lunch then all a sudden he (we were opposite his table) turned his head round and stared at me for like 10 seconds...creeeeeepy..hard to imagine he has friends (like 4) Anyway ive had enough of him what can we do to totally ruin him we break up soon the 1st being the last day (we have a walk trip at 12 pm) :) thx !!