1989: Todd "Marijuanavich" Marinovich shoulder butts him after making a good play, and taunts him. Kowalkowski gets his revenge late the game by absolutely leveling Marinovich, even hurting Marijuana Boy's shoulder badly. He barely threw wounded ducks for the last few plays.
1990: Eric Hunter mouths off at him. A series or two later, Kowalkowski squats under Hunter, and drives his legs upward, smashing his shoulder pad against Hunter's jaw. That definitely rang Hunter's bell, and he was quite gunshy after that.
He was one of the quietest, no nonsense, no showboating people you'd see on that team, but definitely stood out in his excellent play.
I wonder what happened to that idiot who tried to pick a fight with him... Even though he's in his 50's, I'm pretty sure Kowalkowski can still lay down some heavy lumber and take such an upstart out to the woodshed...