No proper fights really. Except for Jiu jitsu sparring that is.
All the "real" fights I've been in were ended by the first move or so. The ones I can remember are one where a guy took my hat and slapped me in the face, so I put him in a headlock. The bastard started crying and ran off.
Then there was this time when I was 5 years old. I don't really know how much truth there is in this one, since I don't remember it myself, but a friend of mine was apparently an onlooker and remembered it quite vividly.
There was this kid in kindergarten who was a mighty prick, so I apparently pushed him to the ground, then jumped onto his chest/stomach with my knees, then started hammerin at him with my fists. (You know, hitting with the bottom of the fist, in a hammering motion, not proper punching with the knuckles)
Oh, and there was this time when a guy was whipping me with his scarf, and when he refused to quit it, I grabbed his scarf and held on tight. He proceeded to walk up to me (who was sitting in a chair at the time) and start slapping me and kicking me on the shin. I didn't fight back then, but decided to instead calmly and humorously narrate the events for the onlookers. Then he tried kicking me in the head, at which point I stood up, shouted at him and walked away.