Detroit Red Wing opponents knew better than to mess with Steve Yzerman. Take a cheap shot at him - or any of the other Wings - and Bob Probert or, in later years, Darren McCarty would be all over you.
It was on-ice justice, and it's been so effective over the years that plenty of players have built careers dishing out the punishing hits. Players including Derek Boogaard.
But Boogaard is now dead, five months after a season-ending concussion, and his family has decided to donate his brain to the researchers who found Probert had signs of brain trauma. Add in a number of high-profile concussions this season, and there's more scrutiny over fighting's place in the NHL.