When I was in the 2nd year of highschool (in the UK so about 12 YO) my friend was trying to use the vending machine and a final year kid (16 YO) started trying to bully us infront of a big group of people and he apparently trained karate

He ended up pushing me into a big door and natural reaction took over and I ended up getting the better of him and being dragged off him after making him look a bit stupid..the only thing was that the bell had rang for class whilst it happened so most of the school had turned up and witnessed

Ended up getting some brownie points and everytime I passed in the future his friends pointed and said to him 'theres the kid that beat you up'

To make matters worse it was a friend's brother and we used to walk to school together and eventually my best friend ended up working at the same building company as him and kept reminding him

Not extremely badass but a fun story, shame I had to go back 10 years for a bad ass story haha