first one I got into was for a tackle in soccer. I won the ball from some guy who thought he was got shit and he got pissy about it. The fight ended after I landed an elbow and broke his nose. We both were kicked out of the league and I was banned for a year from going back.
the second was when I played football in college at a D2 school. I played linebacker and my fellow linebacker lit up this defenseless receiver when he touched the ball and knocked him out. A few players charged him and I got into it with the tight end. Nothing serious happened, got thrown out.
the last one was a few weeks ago. I was playing soccer with my gf's brother at indoor and someone tackled our friend and snapper his leg. One guy on our team got a broken orbital bone from the fight, and we knocked out two of them.