Disaster Girl

I don't know if this counts as revenge, but this kid made fun of me for being dumb. (He was the type of kid that would scramble his Rubix Cube 6 turns to maybe a fake scramble and resolve it.) So I told him
"Scramble this"
I gave him my Rubix Cube
"Ok you wouldn't even be able to solve it"
He scrambled it behind his back.
I solved the cube in 45 seconds.
Everyone started giving me their cubes to solve.
And that is why you don't mess with the kid with perfect grades.

Back in 4th grade a guy broke my fidget spinner, so me and all my friends made his school year so rough that he left after that year.
Before you call me an a-hole (I probably was but still), I eventually contacted him, and we're on good terms now.
TL;DR: Kid broke my fidget spinner, we broke his reputation.

back in my school days a guy stole my yu-gi-u cards next day someone stool his periscope

This was way back in second grade. Our substitute teacher was an a-hole. I challenged my friend to name as many MLK facts as she could. When I told her to stop the sub did the only logical thing to do and took away 15 minutes of my recess (that punishment will hurt kids) When I finally finished the time, we were trying to play on a part of the playground. She told us to frick off. Then she got fired.
TL;DR: I took the time to write you take the time to read it.

*claps wildly*

Once a kid in hockey pushed me to the ice but luckily the ref saw it and put him in the penalty box for interference.