Football story...8 man.
I was placed at right guard on the offensive line. We did a play where I pull off the line, run to the left and smash defenders for a ball-runner. At 6'3, 225lbs, I always loved getting away from lineman duty and getting some speed-work in.
I was headed full-steam for one lonesome little guy, probably 140 pounds. He stood motionless and I recall thinking of the great joy I was about to experience from this unfair fight. Just before impact, he chopped. I took a helmet full-force to the knee. It was quite painful. The burn was such I that I was sure stuff was torn inside me. I was spared a few plays, though with a team lacking depth of any sort, I finished the game with a flimsy brace.