Headshots are not a modern phenomena. Here's Mark Messier absolutely crushing Mike Modano sometime in the mid 90's to kick off what might become a regular feature - one day a week to feature all those old videos collecting dust on youtube. The craziest part of this video is the end when the ambulance guys actually drop Modano when he's tied down to the stretcher. An absolute classic.
Here's Steve Yzerman getting in to a scrap in the 80's that also features Bob Probert versus Tom Barrasso!
Here's the famous Steve Sullivan "karma" incident where he and a fan get into it pretty good.