I have never really gotten into a fight per se, but some scuffles.
I remember one clearly:
I was standing in line to have my test graded in 5th grade math, and there was this jerk behind me. His back was about 3ft from the wall, as the line curved and they were standing parrallel. This is important for later.
So I was standing there, and the little jerk wouldnt leave me alone. Poking, hitting, slapping the back of my head. No matter what I said, he wouldnt stop, and the instructor was oblivious. Luckily, he was also the basketball coach.
Much to the dismay of the jerk in question, I had seen Goldfinger the night previously, and for some reason, the get-out-of-a-choke hands up then slammed into the ribcage move stuck with me. So, I turn around, and push him and tell him to stop. He decides he is going to grab me by the sholders and try something. Having remembered the move well, I executed it flawlessly. Hands up between his, knocking his arms out of the way, then straight down into his ribs with authority! He doubled over, and then I promptly body slammed him (little skinny punk, I weighed almost twice what he did) into the concrete wall. I then told him in a scary calm voice to "leave me alone." He did so after that...
My teacher said to take it outside next time, and not in his classroom. Ehh.